(1-azinone)-substituted pyridoindoles

ABSTRACT

Substituted pyridoindoles for incorporation in pharmaceutical compositions employed in the treatment of various diseases correspond to formula (I) 
     
       
         
         
             
             
         
       
     
     wherein R 1  is H or optionally substituted alkyl; R 2 , R 3 , R 4  are each independently selected from H, —O-alkyl, —S-alkyl, alkyl, halo, —CF 3 , and —CN; G is —CR 12 R 13 —NR 5 — or —NR 5 —CR 12 R 13 ; R 5  is H, optionally substituted alkyl, optionally substituted heterocycle, —C(═O)—R 6 , —C(═O)—O—R 7 , or —C(═O)—NR 19 R 20 ; R 6  and R 7  are each optionally substituted alkyl or optionally substituted heterocycle; R 8 , R 9 , R 10 , R 11 , R 12 , R 13 , R 19  and R 20  are each independently selected from H or optionally substituted alkyl; R 14  and R 15  are each independently H or halogen; L is —CH 2 —O—, —CH 2 CH 2 —, —CH═CH— or a bond; and B is aryl or heteroaryl or cycloalkyl; with the proviso that, when L is a direct bond, B cannot be unsubstituted heteroaryl or heteroaryl monosubstituted with fluorine.

This application is a continuation of U.S. patent application Ser. No. 15/045,652, filed Feb. 17, 2016, which is a divisional of U.S. patent application Ser. No. 14/223,151, filed Mar. 24, 2014, which is a divisional of U.S. patent application Ser. No. 12/351,561, filed Jan. 9, 2009, which claims priority of U.S. Provisional Patent Application Ser. No. 61/020,530, filed Jan. 11, 2008, and U.S. Provisional Patent Application Ser. No. 61/048,677, filed Apr. 29, 2008, which are hereby incorporated by reference in their entirety.

FIELD OF THE INVENTION

The invention relates to human melanin-concentrating hormone (MCH₁) receptor-selective antagonists substituted pyridoindoles that are useful for treating obesity, to pharmaceutical compositions comprising these compounds, and to methods for the treatment of obesity, anxiety, depression, and psychiatric disorders in a mammal.

BACKGROUND OF THE INVENTION

Obesity and the multitude of co-morbidities associated with obesity such as diabetes, dyslipidemia, coronary heart disease, and certain cancers are a major concern for public health. The currently available pharmaceutical therapies for the treatment of obesity have limited efficacy and side effects that limit their use. Thus, there is a significant medical need for better pharmacotherapy for obesity.

Melanin-concentrating hormone (MCH) has been identified as an orexigenic peptide that exerts an effect on food intake and body weight regulation. MCH is a cyclic 19 amino acid neuropeptide expressed in the zona incerta and lateral hypothalamus in response to both energy restriction and leptin deficiency. MCH is known to stimulate feeding when injected into the lateral ventricle of rats and the mRNA for MCH is upregulated in the hypothalamus of genetically obese mice (ob/ob) and in fasted control and ob/ob animals. In addition, animals treated with MCH show increases in glucose, insulin and leptin levels, mimicking human metabolic syndrome (Gomori, A. Chronic infusion of MCH causes obesity in mice Am. J. Physiol. Endocrinol. Metab. 284, E583, 2002). Mice lacking MCH are hypophagic and lean with increased metabolic rate, whereas animals over-expressing MCH gain excess weight on both standard and high fat diets. MCH is thought to have effects on other nervous system functions as well (Rocksz, L. L. Biological Examination of Melanin Concentrating Hormone 1: Multi-tasking from the hypothalamus Drug News Perspect 19(5), 273, 2006). An orphan G-protein coupled receptor (GPCR) was recently identified as a receptor for MCH. Disruption of the binding between MCH and the MCH receptor, i.e. MCH antagonism, may thus be used to counteract the effects of MCH (McBriar, M. D. Recent advances in the discovery of melanin-concentrating hormone receptor antagonists Curr. Opin. Drug Disc. & Dev. 9(4), 496, 2006).

SUMMARY OF THE INVENTION

In accordance the present invention, there is provided a compound of formula (I)

wherein R¹ is H or optionally substituted alkyl; R², R³, R⁴ are each independently selected from H, —O-alkyl, —S-alkyl, alkyl, halo, —CF₃, and —CN; G is —CR¹²R¹³—NR⁵— or —NR⁵—CR¹²R¹³; R⁵ is H, optionally substituted alkyl, optionally substituted heterocycle, —C(═O)—R⁶, —C(═O)—O—R⁷, or —C(═O)—NR¹⁹R²⁰; R⁶ and R⁷ are each optionally substituted alkyl or optionally substituted heterocycle; R⁸, R⁹, R¹⁰, R¹¹, R¹², R¹³, R¹⁹ and R²⁰ are each independently selected from H or optionally substituted alkyl; R¹⁴ and R¹⁵ are each independently H or halogen;

Y is CH or N;

L is —CH₂—O—, —CH₂CH₂—, —CH═CH— or a bond; and B is aryl or heteroaryl or cycloalkyl; with the proviso that, when L is a direct bond, B cannot be unsubstituted heteroaryl or heteroaryl monosubstituted with fluorine.

DETAILED DESCRIPTION OF THE INVENTION

In accordance with the present invention, compounds represented by formula (I) above may be substituted derivatives either of tetrahydro-β-carboline, where G is —CR¹²R¹³—NR⁵—, or of tetrahydro-7-carboline, where G is —NR⁵—CR¹²R¹³—. In some embodiments of the invention, G is —CH₂—NR⁵—; in other embodiments, G is —NR⁵—CH₂—.

In accordance with some embodiments of the invention, R¹ is H.

In accordance with other embodiments of the invention, R¹ is alkyl, for example, methyl or ethyl.

In accordance with some embodiments of the invention, R⁵ is H. In other embodiments, R⁵ is optionally substituted alkyl. In some embodiments, R⁵ is selected from methyl, ethyl, 2-propyl, 2-hydroxyethyl, 2,2,2-trifluoroethyl, 3,3,3-trifluoropropyl, 2-oxo-2-(pyrrolidin-1-yl)ethyl, 2-(pyrrolidin-1-yl)ethyl and (S)-pyrrolidin-2-ylmethyl. In other embodiments, R⁵ is optionally substituted heterocycle. In some embodiments, R⁵ is selected from piperidin-4-yl and 1-methylpiperidin-4-yl. In other embodiments, R⁵ is —C(═O)—R⁶. In other embodiments, R⁵ is —C(═O)—O—R⁷.

In some embodiments, R⁶ and R⁷ are each optionally substituted alkyl, for example, methyl, 2-propyl, 2-(pyrrolidin-1-yl)-ethyl, pyrrolidin-1-ylmethyl, and dimethylaminomethyl. In some embodiments, R⁶ is optionally substituted heterocycle, for example, pyrrolidin-3-yl, (R)-pyrrolidin-2-yl, (S)-pyrrolidin-2-yl, 1-methylpyrrolidin-3-yl, (R)-1-methylpyrrolidin-2-yl and (S)-1-methylpyrrolidin-2-yl.

In accordance with some embodiments of the invention, the compound has the structure

In accordance with other embodiments of the invention, the compound has the structure

In accordance with some embodiments of the invention, the L is a bond. In accordance with other embodiments of the invention, L is —CH₂—O—. In accordance with some embodiments of the invention, L is —CH₂CH₂—. In accordance with other embodiments of the invention, L is —CH═CH—.

In accordance with some embodiments of the invention, B is aryl, for example, phenyl. In accordance with other embodiments of the invention, B is heteroaryl, for example, pyridinyl. In some embodiments, B is pyridin-2-yl or pyridin-3-yl. In other embodiments, B is pyridazinyl, for example, pyridazin-3-yl. In some other embodiments, B is pyrimidinyl, for example, pyrimidin-5-yl or pyrimidin-2-yl. In accordance with other embodiments of the invention, B is cycloalkyl, for example, cyclohexyl.

In accordance with some embodiments of the invention, R², R³ and R⁴ are each H. In accordance with other embodiments of the invention, two of R², R³ and R⁴ are H, and the other of R², R³ and R⁴ is selected from trifluoromethyl, chloro, fluoro, methyl, methoxy and methanethio.

In accordance with other embodiments of the invention, one of R², R³ and R⁴ is H, another of R², R³ and R⁴ is Cl, and the third of R², R³ and R⁴ is F, Cl or methoxy. In accordance with other embodiments of the invention, one of R², R³ and R⁴ is H, another of R², R³ and R⁴ is F, and the third of R², R³ and R⁴ is methoxy. In accordance with other embodiments of the invention, one of R², R³ and R⁴ is H, another of R², R³ and R⁴ is methoxy, and the third of R², R³ and R⁴ is methyl.

In accordance with some embodiments of the invention, B, together with R², R³ and R⁴, is selected from phenyl, 4-trifluoromethylphenyl, 4-chlorophenyl, 2,4-dichlorophenyl, 4-fluorophenyl, 4-chloro-2-fluorophenyl, 2-fluoro-4-methoxyphenyl, pyridin-2-yl, 5-chloropyridin-2-yl, 5-(trifluoromethyl)pyridin-2-yl, 5-fluoropyridin-2-yl, 6-(trifluoromethyl)pyridazin-3-yl, 6-methylpyridazin-3-yl, 4-fluoro-2-methoxyphenyl, 6-(trifluoromethyl)pyridin-3-yl, 2-(trifluoromethyl)pyrimidin-5-yl, 5-(trifluoromethyl)pyrimidin-2-yl, 5-methylpyridin-2-yl, 6-methylpyridin-3-yl, cyclohexyl, 4-chloro-2-methoxyphenyl, pyrimidin-2-yl, imidazo[1,2-a]pyridin-6-yl, imidazo[1,2-a]pyridin-2-yl, 4-methoxyphenyl, 4-methanethiophenyl and 4-methoxy-2-methylphenyl.

In accordance with some embodiments of the invention, at least one of R⁸, R⁹, R¹⁰, R¹¹, R¹², R¹³, R¹⁹ and R²⁰ is H. In other embodiments, at least one of R⁸, R⁹, R¹⁰, R¹¹, R¹², R¹³, R¹⁹ and R²⁰ is optionally substituted alkyl, for example, methyl, ethyl, or hydroxymethyl.

In accordance with some embodiments of the invention, the compound is selected from

In accordance with some embodiments of the invention, the compound is a pharmaceutically acceptable salt thereof. In some embodiments, the salt is an HCl salt.

There is also provided, in accordance with embodiments of the invention, a pharmaceutical composition comprising a compound as described herein, and a pharmaceutically acceptable carrier, excipient or diluent therefore.

There is also provided, in accordance with embodiments of the invention, a method of treating obesity, comprising administering to a patient in need of obesity reduction an obesity-reducing effective amount of a compound as described herein.

There is also provided, in accordance with embodiments of the invention, a method of treating anxiety, comprising administering to a patient in need of such treatment a therapeutically effective amount of a compound as described herein.

There is also provided, in accordance with embodiments of the invention, a method of treating depression, comprising administering to a patient in need of such treatment a therapeutically effective amount of a compound as described herein.

There is also provided, in accordance with embodiments of the invention, a method of treating non-alcoholic fatty liver disease, comprising administering to a patient in need of such treatment a therapeutically effective amount of a compound as described herein.

There is also provided, in accordance with embodiments of the invention, a method of treating a disease or condition which is susceptible to treatment with an MCH₁ receptor modulator, comprising administering to a patient in need thereof a therapeutically effective amount of a compound as described herein.

Definitions

Throughout this specification the terms and substituents retain their definitions.

Alkyl is intended to include linear, branched, or cyclic hydrocarbon structures and combinations thereof. When not otherwise restricted, the term refers to alkyl of 20 or fewer carbons. Lower alkyl refers to alkyl groups of 1, 2, 3, 4, 5 and 6 carbon atoms. Examples of lower alkyl groups include methyl, ethyl, propyl, isopropyl, butyl, s- and t-butyl and the like. Cycloalkyl is a subset of alkyl and includes cyclic hydrocarbon groups of 3, 4, 5, 6, 7, and 8 carbon atoms. Examples of cycloalkyl groups include c-propyl, c-butyl, c-pentyl, norbornyl, adamantyl and the like.

C₁ to C₂₀ Hydrocarbon (e.g. C₁, C₂, C₃, C₄, C₅, C₆, C₇, C₈, C₉, C₁₀, C₁₁, C₁₂, C₁₃, C₁₄, C₁₅, C₁₆, C₁₇, C₁₈, C₁₉, C₂₀) includes alkyl, cycloalkyl, alkenyl, alkynyl, aryl and combinations thereof. Examples include benzyl, phenethyl, cyclohexylmethyl, camphoryl and naphthylethyl. The term “phenylene” refers to ortho, meta or para residues of the formulae:

Alkoxy or alkoxyl refers to groups of 1, 2, 3, 4, 5, 6, 7 or 8 carbon atoms of a straight, branched, cyclic configuration and combinations thereof attached to the parent structure through an oxygen. Examples include methoxy, ethoxy, propoxy, isopropoxy, cyclopropyloxy, cyclohexyloxy and the like. Lower-alkoxy refers to groups containing one to four carbons. For the purposes of the present patent application alkoxy also includes methylenedioxy and ethylenedioxy in which each oxygen atom is bonded to the atom, chain or ring from which the methylenedioxy or ethylenedioxy group is pendant so as to form a ring. Thus, for example, phenyl substituted by alkoxy may be, for example,

Oxaalkyl refers to alkyl residues in which one or more carbons (and their associated hydrogens) have been replaced by oxygen. Examples include methoxypropoxy, 3,6,9-trioxadecyl and the like. The term oxaalkyl is intended as it is understood in the art [see Naming and Indexing of Chemical Substances for Chemical Abstracts, published by the American Chemical Society, ¶196, but without the restriction of ¶127(a)], i.e. it refers to compounds in which the oxygen is bonded via a single bond to its adjacent atoms (forming ether bonds). Similarly, thiaalkyl and azaalkyl refer to alkyl residues in which one or more carbons have been replaced by sulfur or nitrogen, respectively. Examples include ethylaminoethyl and methylthiopropyl.

Acyl refers to groups of 1, 2, 3, 4, 5, 6, 7 and 8 carbon atoms of a straight, branched, cyclic configuration, saturated, unsaturated and aromatic and combinations thereof, attached to the parent structure through a carbonyl functionality. One or more carbons in the acyl residue may be replaced by nitrogen, oxygen or sulfur as long as the point of attachment to the parent remains at the carbonyl. Examples include formyl, acetyl, propionyl, isobutyryl, t-butoxycarbonyl, benzoyl, benzyloxycarbonyl and the like. Lower-acyl refers to groups containing one to four carbons.

Aryl and heteroaryl refer to aromatic or heteroaromatic rings, respectively, as substituents. Heteroaryl contains one, two or three heteroatoms selected from O, N, or S. Both refer to monocyclic 5- or 6-membered aromatic or heteroaromatic rings, bicyclic 9- or 10-membered aromatic or heteroaromatic rings and tricyclic 13- or 14-membered aromatic or heteroaromatic rings. Aromatic 6, 7, 8, 9, 10, 11, 12, 13 and 14-membered carbocyclic rings include, e.g., benzene, naphthalene, indane, tetralin, and fluorene and the 5, 6, 7, 8, 9 and 10-membered aromatic heterocyclic rings include, e.g., imidazole, pyridine, indole, thiophene, benzopyranone, thiazole, furan, benzimidazole, quinoline, isoquinoline, quinoxaline, pyrimidine, pyrazine, tetrazole and pyrazole.

Arylalkyl means an alkyl residue attached to an aryl ring. Examples are benzyl, phenethyl and the like.

Substituted alkyl, aryl, cycloalkyl, heterocyclyl etc. refer to alkyl, aryl, cycloalkyl, or heterocyclyl wherein up to three H atoms in each residue are replaced with alkyl, halogen, haloalkyl, hydroxy, loweralkoxy, carboxy, carboalkoxy (also referred to as alkoxycarbonyl), carboxamido (also referred to as alkylaminocarbonyl), cyano, carbonyl, nitro, amino, alkylamino, dialkylamino, mercapto, alkylthio, sulfoxide, sulfone, acylamino, amidino, phenyl, benzyl, heteroaryl, phenoxy, benzyloxy, or heteroaryloxy.

The term “halogen” means fluorine, chlorine, bromine or iodine.

The term “prodrug” refers to a compound that is made more active in vivo. Commonly the conversion of prodrug to drug occurs by enzymatic processes in the liver or blood of the mammal. Many of the compounds of the invention may be chemically modified without absorption into the systemic circulation, and in those cases, activation in vivo may come about by chemical action (as in the acid-catalyzed cleavage in the stomach) or through the intermediacy of enzymes and microflora in the gastrointestinal GI tract.

In the characterization of some of the substituents, it is recited that certain substituents may combine to form rings. Unless stated otherwise, it is intended that such rings may exhibit various degrees of unsaturation (from fully saturated to fully unsaturated), may include heteroatoms and may be substituted with lower alkyl or alkoxy.

It will be recognized that the compounds of this invention can exist in radiolabeled form, i.e., the compounds may contain one or more atoms containing an atomic mass or mass number different from the atomic mass or mass number usually found in nature. Radioisotopes of hydrogen, carbon, phosphorous, fluorine, iodine and chlorine include ³H, ¹⁴C, ³⁵S, ¹⁸F, ³²P, ³³P, ¹²⁵I, and ³⁶Cl, respectively. Compounds that contain those radioisotopes and/or other radioisotopes of other atoms are within the scope of this invention. Radiolabeled compounds described herein and prodrugs thereof can generally be prepared by methods well known to those skilled in the art. Conveniently, such radiolabeled compounds can be prepared by carrying out the procedures disclosed in the Examples and Schemes by substituting a readily available radiolabeled reagent for a non-radiolabeled reagent.

The terms “methods of treating or preventing” mean amelioration, prevention or relief from the symptoms and/or effects associated with lipid disorders. The term “preventing” as used herein refers to administering a medicament beforehand to forestall or obtund an acute episode or, in the case of a chronic condition to diminish the likelihood or seriousness of the condition. The person of ordinary skill in the medical art (to which the present method claims are directed) recognizes that the term “prevent” is not an absolute term. In the medical art it is understood to refer to the prophylactic administration of a drug to substantially diminish the likelihood or seriousness of a condition, and this is the sense intended in applicants' claims. As used herein, reference to “treatment” of a patient is intended to include prophylaxis.

Throughout this application, various references are referred to. Each of the patents, patent applications, patent publications, and references mentioned herein is hereby incorporated by reference in its entirety.

The term “mammal” is used in its dictionary sense. The term “mammal” includes, for example, mice, hamsters, rats, cows, sheep, pigs, goats, and horses, monkeys, dogs (e.g., Canis familiaris), cats, rabbits, guinea pigs, and primates, including humans.

Compounds described herein may contain one or more asymmetric centers and may thus give rise to enantiomers, diastereomers, and other stereoisomeric forms. Each chiral center may be defined, in terms of absolute stereochemistry, as (R)- or (S)-. The present invention is meant to include all such possible isomers, as well as mixtures thereof, including racemic and optically pure forms. Optically active (R)- and (S)-, (−)- and (+)-, or (D)- and (L)-isomers may be prepared using chiral synthons or chiral reagents, or resolved using conventional techniques. When the compounds described herein contain olefinic double bonds or other centers of geometric asymmetry, and unless specified otherwise, it is intended that the compounds include both E and Z geometric isomers. The configuration of any carbon-carbon double bond appearing herein is selected for convenience only and is not intended to designate a particular configuration; thus a carbon-carbon double bond depicted arbitrarily herein as E may be Z, E, or a mixture of the two in any proportion. Likewise, all tautomeric forms are also intended to be included.

As used herein, and as would be understood by the person of skill in the art, the recitation of “a compound” is intended to include salts, solvates and inclusion complexes of that compound as well as any stereoisomeric form, or a mixture of any such forms of that compound in any ratio. Thus, in accordance with some embodiments of the invention, a compound as described herein, including in the contexts of pharmaceutical compositions, methods of treatment, and compounds per se, is provided as the salt form. In accordance with some embodiments of the invention, the salt is a hydrochloride salt.

The term “enantiomeric excess” is well known in the art and is defined for a resolution of ab into a+b as

${ee}_{a} = {\left( \frac{{{{conc}.\mspace{11mu} {of}}\mspace{14mu} a} - {{{conc}.\mspace{11mu} {of}}\mspace{14mu} b}}{{{{conc}.\mspace{11mu} {of}}\mspace{14mu} a} + {{{conc}.\mspace{11mu} {of}}\mspace{14mu} b}} \right) \times 100}$

The term “enantiomeric excess” is related to the older term “optical purity” in that both are measures of the same phenomenon. The value of ee will be a number from 0 to 100, zero being racemic and 100 being pure, single enantiomer. A compound which in the past might have been called 98% optically pure is now more precisely described as 96% ee; in other words, a 90% ee reflects the presence of 95% of one enantiomer and 5% of the other in the material in question.

Terminology related to “protecting”, “deprotecting” and “protected” functionalities occurs throughout this application. Such terminology is well understood by persons of skill in the art and is used in the context of processes which involve sequential treatment with a series of reagents. In that context, a protecting group refers to a group which is used to mask a functionality during a process step in which it would otherwise react, but in which reaction is undesirable. The protecting group prevents reaction at that step, but may be subsequently removed to expose the original functionality. The removal or “deprotection” occurs after the completion of the reaction or reactions in which the functionality would interfere. Thus, when a sequence of reagents is specified, as it is in the processes of the invention, the person of ordinary skill can readily envision those groups that would be suitable as “protecting groups”. Suitable groups for that purpose are discussed in standard textbooks in the field of chemistry, such as Protective Groups in Organic Synthesis by T. W. Greene [John Wiley & Sons, New York, 1991], which is incorporated herein by reference. Particular attention is drawn to the chapters entitled “Protection for the Hydroxyl Group, Including 1,2- and 1,3-Diols” (pages 10-86).

The following abbreviations and terms have the indicated meanings throughout: Ac=acetyl; Bu=butyl; c-=cyclo; DIEA=N,N-diisopropylethyl amine; TEA=triethylamine; HOAc=acetic acid; mesyl=methanesulfonyl; rt=room temperature; sat'd=saturated; s-=secondary; t-=tertiary; TMS=trimethylsilyl; tosyl=p-toluenesulfonyl; TFA=trifluoroacetic acid; HATU=O-(7-azabenzotriazol-1-yl)-N,N,N′N′-tetramethyluronium hexafluorophosphate. The abbreviations HPLC, THF, DCM and DMSO represent high performance liquid chromatography, tetrahydrofuran, dichloromethane and dimethylsulfoxide, respectively. The abbreviations Me, Et, Ph, Tf, Ts, Boc and Ms represent methyl, ethyl, phenyl, trifluoromethanesulfonyl, toluenesulfonyl, butyloxycarbonyl and methanesulfonyl respectively. The term dppf refers to 1,1′-Bis-(diphosphenylphosphino)ferrocene. A comprehensive list of abbreviations utilized by organic chemists (i.e. persons of ordinary skill in the art) appears in the first issue of each volume of the Journal of Organic Chemistry. The list, which is typically presented in a table entitled “Standard List of Abbreviations” is incorporated herein by reference.

While it may be possible for the compounds of the invention to be administered as the raw chemical, it is preferable to present them as a pharmaceutical composition. In accordance with an embodiment of the present invention there is provided a pharmaceutical composition comprising a compound of formula I or a pharmaceutically acceptable salt or solvate thereof, together with one or more pharmaceutically carriers thereof and optionally one or more other therapeutic ingredients. The carrier(s) must be “acceptable” in the sense of being compatible with the other ingredients of the formulation and not deleterious to the recipient thereof. Furthermore, notwithstanding the statement above regarding the term “compound” including salts thereof as well, so that independent claims reciting “a compound” will be understood as referring to salts thereof as well, if in an independent claim reference is made to a compound or a pharmaceutically acceptable salt thereof, it will be understood that claims which depend from that independent claim which refer to such a compound also include pharmaceutically acceptable salts of the compound, even if explicit reference is not made to the salts in the dependent claim.

The formulations include those suitable for oral, parenteral (including subcutaneous, intradermal, intramuscular, intravenous and intraarticular), rectal and topical (including dermal, buccal, sublingual and intraocular) administration. The most suitable route may depend upon the condition and disorder of the recipient. The formulations may conveniently be presented in unit dosage form and may be prepared by any of the methods well known in the art of pharmacy. Such methods include the step of bringing into association a compound of formula I or a pharmaceutically acceptable salt or solvate thereof (“active ingredient”) with the carrier, which constitutes one or more accessory ingredients. In general, the formulations are prepared by uniformly and intimately bringing into association the active ingredient with liquid carriers or finely divided solid carriers or both and then, if necessary, shaping the product into the desired formulation.

Formulations suitable for oral administration may be presented as discrete units such as capsules, cachets or tablets each containing a predetermined amount of the active ingredient; as a powder or granules; as a solution or a suspension in an aqueous liquid or a non-aqueous liquid; or as an oil-in-water liquid emulsion or a water-in-oil liquid emulsion. The active ingredient may also be presented as a bolus, electuary or paste.

A tablet may be made by compression or molding, optionally with one or more accessory ingredients. Compressed tablets may be prepared by compressing in a suitable machine the active ingredient in a free-flowing form such as a powder or granules, optionally mixed with a binder, lubricant, inert diluent, lubricating, surface active or dispersing agent. Molded tablets may be made by molding in a suitable machine a mixture of the powdered compound moistened with an inert liquid diluent. The tablets may optionally be coated or scored and may be formulated so as to provide sustained, delayed or controlled release of the active ingredient therein.

The pharmaceutical compositions may include a “pharmaceutically acceptable inert carrier”, and this expression is intended to include one or more inert excipients, which include starches, polyols, granulating agents, microcrystalline cellulose, diluents, lubricants, binders, disintegrating agents, and the like. If desired, tablet dosages of the disclosed compositions may be coated by standard aqueous or nonaqueous techniques, “Pharmaceutically acceptable carrier” also encompasses controlled release means.

Pharmaceutical compositions may also optionally include other therapeutic ingredients, anti-caking agents, preservatives, sweetening agents, colorants, flavors, desiccants, plasticizers, dyes, and the like. Any such optional ingredient must be compatible with the compound of formula I to insure the stability of the formulation. The composition may contain other additives as needed, including for example lactose, glucose, fructose, galactose, trehalose, sucrose, maltose, raffinose, maltitol, melezitose, stachyose, lactitol, palatinite, starch, xylitol, mannitol, myoinositol, and the like, and hydrates thereof, and amino acids, for example alanine, glycine and betaine, and peptides and proteins, for example albumen.

Examples of excipients for use as the pharmaceutically acceptable carriers and the pharmaceutically acceptable inert carriers and the aforementioned additional ingredients include, but are not limited to binders, fillers, disintegrants, lubricants, anti-microbial agents, and coating agents.

The dose range for adult humans is generally from 0.005 mg to 10 g/day orally. Tablets or other forms of presentation provided in discrete units may conveniently contain an amount of compound of formula I which is effective at such dosage or as a multiple of the same, for instance, units containing 5 mg to 500 mg, usually around 10 mg to 200 mg. The precise amount of compound administered to a patient will be the responsibility of the attendant physician. However, the dose employed will depend on a number of factors, including the age and sex of the patient, the precise disorder being treated, and its severity.

A dosage unit (e.g. an oral dosage unit) can include from, for example, 1 to 30 mg, 1 to 40 mg, 1 to 100 mg, 1 to 300 mg, 1 to 500 mg, 2 to 500 mg, 3 to 100 mg, 5 to 20 mg, 5 to 100 mg (e.g. 1 mg, 2 mg, 3 mg, 4 mg, 5 mg, 6 mg, 7 mg, 8 mg, 9 mg, 10 mg, 11 mg, 12 mg, 13 mg, 14 mg, 15 mg, 16 mg, 17 mg, 18 mg, 19 mg, 20 mg, 25 mg, 30 mg, 35 mg, 40 mg, 45 mg, 50 mg, 55 mg, 60 mg, 65 mg, 70 mg, 75 mg, 80 mg, 85 mg, 90 mg, 95 mg, 100 mg, 150 mg, 200 mg, 250 mg, 300 mg, 350 mg, 400 mg, 450 mg, 500 mg) of a compound described herein.

For additional information about pharmaceutical compositions and their formulation, see, for example, Remington: The Science and Practice of Pharmacy, 20^(th) Edition, 2000.

The agents can be administered, e.g., by intravenous injection, intramuscular injection, subcutaneous injection, intraperitoneal injection, topical, sublingual, intraarticular (in the joints), intradermal, buccal, ophthalmic (including intraocular), intranasaly (including using a cannula), or by other routes. The agents can be administered orally, e.g., as a tablet or cachet containing a predetermined amount of the active ingredient, gel, pellet, paste, syrup, bolus, electuary, slurry, capsule, powder, granules, as a solution or a suspension in an aqueous liquid or a non-aqueous liquid, as an oil-in-water liquid emulsion or a water-in-oil liquid emulsion, via a micellar formulation (see, e.g. WO 97/11682) via a liposomal formulation (see, e.g., EP 736299, WO 99/59550 and WO 97/13500), via formulations described in WO 03/094886 or in some other form. The agents can also be administered transdermally (i.e. via reservoir-type or matrix-type patches, microneedles, thermal poration, hypodermic needles, iontophoresis, electroporation, ultrasound or other forms of sonophoresis, jet injection, or a combination of any of the preceding methods (Prausnitz et al. 2004, Nature Reviews Drug Discovery 3:115)). The agents can be administered locally, for example, at the site of injury to an injured blood vessel. The agents can be coated on a stent. The agents can be administered using high-velocity transdermal particle injection techniques using the hydrogel particle formulation described in U.S. 20020061336. Additional particle formulations are described in WO 00/45792, WO 00/53160, and WO 02/19989. An example of a transdermal formulation containing plaster and the absorption promoter dimethylisosorbide can be found in WO 89/04179. WO 96/11705 provides formulations suitable for transdermal administration.

The agents can be administered in the form a suppository or by other vaginal or rectal means. The agents can be administered in a transmembrane formulation as described in WO 90/07923. The agents can be administered non-invasively via the dehydrated particles described in U.S. Pat. No. 6,485,706. The agent can be administered in an enteric-coated drug formulation as described in WO 02/49621. The agents can be administered intranasaly using the formulation described in U.S. Pat. No. 5,179,079. Formulations suitable for parenteral injection are described in WO 00/62759. The agents can be administered using the casein formulation described in U.S. 20030206939 and WO 00/06108. The agents can be administered using the particulate formulations described in U.S. 20020034536.

The agents, alone or in combination with other suitable components, can be administered by pulmonary route utilizing several techniques including but not limited to intratracheal instillation (delivery of solution into the lungs by syringe), intratracheal delivery of liposomes, insufflation (administration of powder formulation by syringe or any other similar device into the lungs) and aerosol inhalation. Aerosols (e.g., jet or ultrasonic nebulizers, metered-dose inhalers (MDIs), and dry-Powder inhalers (DPIs)) can also be used in intranasal applications. Aerosol formulations are stable dispersions or suspensions of solid material and liquid droplets in a gaseous medium and can be placed into pressurized acceptable propellants, such as hydrofluoroalkanes (HFAs, i.e. HFA-134a and HFA-227, or a mixture thereof), dichlorodifluoromethane (or other chlorofluorocarbon propellants such as a mixture of Propellants 11, 12, and/or 114), propane, nitrogen, and the like. Pulmonary formulations may include permeation enhancers such as fatty acids, and saccharides, chelating agents, enzyme inhibitors (e.g., protease inhibitors), adjuvants (e.g., glycocholate, surfactin, span 85, and nafamostat), preservatives (e.g., benzalkonium chloride or chlorobutanol), and ethanol (normally up to 5% but possibly up to 20%, by weight). Ethanol is commonly included in aerosol compositions as it can improve the function of the metering valve and in some cases also improve the stability of the dispersion.

Pulmonary formulations may also include surfactants which include but are not limited to bile salts and those described in U.S. Pat. No. 6,524,557 and references therein. The surfactants described in U.S. Pat. No. 6,524,557, e.g., a C₈-C₁₆ fatty acid salt, a bile salt, a phospholipid, or alkyl saccharide are advantageous in that some of them also reportedly enhance absorption of the compound in the formulation.

Also suitable in the invention are dry powder formulations comprising a therapeutically effective amount of active compound blended with an appropriate carrier and adapted for use in connection with a dry-powder inhaler. Absorption enhancers that can be added to dry powder formulations of the present invention include those described in U.S. Pat. No. 6,632,456. WO 02/080884 describes new methods for the surface modification of powders. Aerosol formulations may include U.S. Pat. No. 5,230,884, U.S. Pat. No. 5,292,499, WO 017/8694, WO 01/78696, U.S. 2003019437, U. S. 20030165436, and WO 96/40089 (which includes vegetable oil). Sustained release formulations suitable for inhalation are described in U.S. 20010036481A1, 20030232019A1, and U.S. 20040018243A1 as well as in WO 01/13891, WO 02/067902, WO 03/072080, and WO 03/079885.

Pulmonary formulations containing microparticles are described in WO 03/015750, U.S. 20030008013, and WO 00/00176. Pulmonary formulations containing stable glassy state powder are described in U.S. 20020141945 and U.S. Pat. No. 6,309,671. Other aerosol formulations are described in EP 1338272A1 WO 90/09781, U.S. Pat. No. 5,348,730, U.S. Pat. No. 6,436,367, WO 91/04011, and U.S. Pat. No. 6,294,153 and U.S. Pat. No. 6,290,987 describes a liposomal based formulation that can be administered via aerosol or other means.

Powder formulations for inhalation are described in U.S. 20030053960 and WO 01/60341. The agents can be administered intranasally as described in U.S. 20010038824.

Solutions of medicament in buffered saline and similar vehicles are commonly employed to generate an aerosol in a nebulizer. Simple nebulizers operate on Bernoulli's principle and employ a stream of air or oxygen to generate the spray particles. More complex nebulizers employ ultrasound to create the spray particles. Both types are well known in the art and are described in standard textbooks of pharmacy such as Sprowls' American Pharmacy and Remington's The Science and Practice of Pharmacy.

Other devices for generating aerosols employ compressed gases, usually hydrofluorocarbons and chlorofluorocarbons, which are mixed with the medicament and any necessary excipients in a pressurized container, these devices are likewise described in standard textbooks such as Sprowls and Remington.

The agent can be incorporated into a liposome to improve half-life. The agent can also be conjugated to polyethylene glycol (PEG) chains. Methods for pegylation and additional formulations containing PEG-conjugates (i.e. PEG-based hydrogels, PEG modified liposomes) can be found in Harris and Chess, Nature Reviews Drug Discovery 2:214-221 and the references therein. The agent can be administered via a nanocochleate or cochleate delivery vehicle (BioDelivery Sciences International). The agents can be delivered transmucosally (i.e. across a mucosal surface such as the vagina, eye or nose) using formulations such as that described in U.S. Pat. No. 5,204,108. The agents can be formulated in microcapsules as described in WO 88/01165. The agent can be administered intra-orally using the formulations described in U.S. 20020055496, WO 00/47203, and U.S. Pat. No. 6,495,120. The agent can be delivered using nanoemulsion formulations described in WO 01/91728A2.

TABLE 1 lists compounds representative of embodiments of the invention.

In general, the compounds of the present invention may be prepared by the methods illustrated in the general reaction schemes as, for example, described below, or by modifications thereof, using readily available starting materials, reagents and conventional synthesis procedures. In these reactions, it is also possible to make use of variants that are in themselves known, but are not mentioned here.

Processes for obtaining the compounds of the invention are presented below. Other compounds of the invention may be prepared in analogous fashion to those whose synthesis is exemplified herein. The procedures below illustrate such methods. Furthermore, although the syntheses depicted herein may result in the preparation of enantiomers having a particular stereochemistry, included within the scope of the present invention are compounds of formula I in any stereoisomeric form, and preparation of compounds of formula I in stereoisomeric forms other than those depicted herein would be obvious to one of ordinary skill in the chemical arts based on the procedures presented herein.

Synthetic Methods

Compounds of formula 3 (wherein R¹⁴ is H or halogen; R¹ is H; R⁵ is a protecting group such as tert-butoxycarbonyl or benzyloxycarbonyl; R⁸, R⁹, R¹⁰, R¹¹, R¹² and R¹³ are each independently selected from H or optionally substituted alkyl) can be prepared from 3- or 4-bromo phenylhydrazine 1 (or a salt thereof) and piperidinone 2 under heated acidic conditions. Optional N5-alkylation or N5-protection of compound 3 can provide compounds of formula 3 wherein R¹ is alkyl or a protecting group such as tert-butoxycarbonyl, benzyloxycarbonyl orp-toluenesulfonyl. Optional removal of N2-protecting group R⁵ and reductive amination, alkylation or acylation can provide compounds of formula 3 wherein R⁵ is alkyl or acyl.

Compounds of formula 1 (wherein R¹⁴ is H or halogen) can be treated with compounds of formula 4 (wherein R¹² and R¹³ are each independently selected from H or optionally substituted alkyl and R¹⁶ is alkyl) and a Lewis acid such as ZnCl₂ under heated conditions to give compounds of formula 5. Treatment of compounds of formula 5 with ethyl glyoxylate under heated acidic conditions can provide compounds of formula 6 wherein R¹⁰ and R¹¹ are H. Alternatively, compounds of formula 5 can be treated with a ketone under heated acidic conditions to provide compounds of formula 6 wherein R¹⁰ and R¹¹ are optionally substituted alkyl. Compounds of formula 5 also can be treated with an acid chloride under basic conditions, followed by heating with POCl₃ and finally by treatment with a reducing agent such as NaBH₄ to provide compounds of formula 6 wherein R¹⁰ is H and R¹¹ is optionally substituted alkyl. Protection of the N2-position on the tetrahydrocarboline ring can provide compounds of formula 7 (wherein R⁵ is a protecting group such as tert-butoxycarbonyl or benzyloxycarbonyl). Protection of the N9-position on the tetrahydrocarboline ring can provide compounds of formula 8 (wherein R¹ is a protecting group such as tert-butoxycarbonyl, benzyloxycarbonyl orp-toluenesulfonyl). Alternatively, treatment of compound 7 with a base such as sodium hydride and an alkylating agent can provide compounds of formula 8 wherein R¹ is optionally substituted alkyl. Optional removal of N2-protecting group R⁵ and reductive amination, alkylation or acylation can provide compounds of formula 8 wherein R⁵ is alkyl or acyl.

Compounds of formula 12 (wherein B is aryl or heteroaryl; R², R³, R⁴ are each independently selected from H, —O-alkyl, S-alkyl, alkyl, halo, —CF₃, and —CN; and Y is CH) can be prepared by treating compounds of formula 9 (wherein X¹ is chlorine, bromine or iodine and Y is CH) with compounds of formula 10 (wherein B is aryl or heteroaryl; R², R³, R⁴ are each independently selected from H, —O-alkyl, alkyl, halo, —CF₃, and —CN; Z¹ is B(OH)₂, B(OR¹⁷)₂, SnR¹⁷ ₃ or the like and R¹⁷ is alkyl), a catalyst such as palladium(0), and a base such as potassium carbonate to give compounds of formula 11, wherein L is a direct bond. Alternatively, in the case where Z¹ is —CH₂OH and B is aryl, heteroaryl or cycloalkyl, compounds of formula 10 can be treated with a base such as sodium hydride and compounds of formula 9 under heated conditions to give compounds of formula 11, wherein L is —CH₂O—. In turn, compounds of formula 11 can be treated with acetic anhydride under heated conditions followed by methanol and water or methanol and sodium hydroxide under ambient to heated conditions to provide compounds of formula 12, wherein L is —CH₂O— or a direct bond.

Alternatively, compounds of formula 12 (wherein B is aryl or heteroaryl; R², R³, R⁴ are each independently selected from H, —O-alkyl, S-alkyl, alkyl, halo, —CF₃, and —CN; and Y is CH) can be prepared by treating compounds of formula 13 (wherein X is chlorine, bromine or iodine and Y is CH) with compounds of formula 10 (wherein Z¹ is —CH═CH—B(OR¹⁷)₂, B(OR¹⁷)₂, SnR¹⁷ ₃ or the like and R¹⁷ is H or alkyl), a catalyst such as palladium(0), and a base such as potassium carbonate to give compounds of formula 14, wherein L is —CH═CH— or a direct bond, in accordance with Z¹. In the case where L is —CH═CH—, compounds of formula 14 can be treated with palladium on carbon under an atmosphere of hydrogen to give compounds of formula 14, wherein L is —CH₂CH₂—. Alternatively, in the case where Z¹ is —CH₂OH, compounds of formula 10 can be treated with compounds of formula 13, a catalyst such as copper iodide, a ligand such as 3,4,7,8-tetramethylphenanthroline and a base such as cesium carbonate under heated conditions to give compounds of formula 14, wherein L is —CH₂O—. In turn, when L is —CH═CH—, —CH₂CH₂—, —CH₂O— or a direct bond, compounds of formula 14 can be heated under acid conditions to provide compounds of formula 12, wherein L is —CH═CH—, —CH₂CH₂—, —CH₂O— or a direct bond, respectively.

Alternatively, compounds of formula 12 (wherein B is aryl or heteroaryl; R², R³, R⁴ are each independently selected from H, —O-alkyl, S-alkyl, alkyl, halo, —CF₃, and —CN; and Y is N) can be prepared from compounds of formula 15 (wherein Y is N and R¹⁸ is a protecting group such as tetrahydropyran-2-yl). The hydroxyl group on compound 15 can be converted to an appropriate activating group to give compounds of formula 16. In the case where Z² is triflate, compounds of formula 15 can be treated with trifluoromethylsulfonic anhydride or N-phenyl trifluoromethanesulfonamide and a base such as triethylamine, pyridine or lithium bis(trimethylsilyl)amide under cooled conditions to give compounds of formula 16. Treatment of compounds of formula 16 with compounds of formula 10 (wherein B is aryl or heteroaryl; R², R³, R⁴ are each independently selected from H, —O-alkyl, S-alkyl, alkyl, halo, —CF₃, and —CN; Z¹=—CH═CH—B(OR¹⁷)₂, B(OH)₂, B(OR¹⁷)₂, SnR¹⁷ ₃ or the like, and R¹⁷=alkyl), a catalyst such as palladium(0), and a base such as potassium carbonate under heated conditions can provide compounds of formula 17, wherein L is —CH═CH— or a direct bond. Removal of the protecting group R¹⁸ on compound 17 can provide compounds of formula 12.

Compounds of formula 18 (wherein B is aryl, heteroaryl or cycloalkyl; R², R³, R⁴ are each independently selected from H, —O-alkyl, —S-alkyl, alkyl, halo, —CF₃, and —CN; L is —CH₂—O—, —CH═CH—, —CH₂CH₂—, or a bond; Y is CH or N; R¹⁴ is H or halogen; R⁵ is alkyl, acyl or a protecting group such as tert-butoxycarbonyl or benzyloxycarbonyl; R¹ is alkyl or a protecting group such as tert-butoxycarbonyl, benzyloxycarbonyl orp-toluenesulfonyl; and R⁸, R⁹, R¹⁰, R¹¹, R¹² and R¹³ are each independently selected from H or optionally substituted alkyl) can be prepared by treating compounds of formula 3 (wherein R⁵ is alkyl, acyl or a protecting group such as tert-butoxycarbonyl or benzyloxycarbonyl and R¹ is alkyl or a protecting group such as tert-butoxycarbonyl, benzyloxycarbonyl orp-toluenesulfonyl) under heated conditions with a catalyst such as copper iodide, a ligand such as trans-1,2-diaminocyclohexane or 8-hydroxyquinoline, a base such as potassium carbonate, cesium carbonate or potassium phosphate and compounds of formula 12 (wherein B is aryl, heteroaryl or cycloalkyl; R², R³, R⁴ are each independently selected from H, —O-alkyl, —S-alkyl, alkyl, halo, —CF₃, and —CN; L is —CH₂—O—, —CH═CH—, —CH₂CH₂—, or a bond; and Y is CH or N). Removal of the N2-protecting group R⁵ followed by reductive amination or alkylation can provide compounds of formula 18, wherein R⁵ is an optionally substituted alkyl group.

Alternatively, following deprotection, N2 can be acylated to give compounds of formula 18 wherein R⁵ is —C(═O)—R⁶ or —C(═O)—O—R⁷, and R⁶ and R⁷ are each optionally substituted alkyl or optionally substituted heterocycle. Additionally, in the case where R¹ is a protecting group, the protecting group can be removed to give compounds of formula 18 wherein R¹ is H.

Alternatively, following removal of the R¹ protecting group, N5 can be alkylated to give compounds of formula 18 wherein R⁵ is an optionally substituted alkyl.

Compounds of formula 19 (wherein B is aryl, heteroaryl or cycloalkyl; R², R³, R⁴ are each independently selected from H, —O-alkyl, —S-alkyl, alkyl, halo, —CF₃, and —CN; L is —CH₂—O—, —CH═CH—, —CH₂CH₂—, or a bond; Y is CH or N; R¹⁴ is H or halogen; R⁵ is alkyl, acyl or a protecting group such as tert-butoxycarbonyl or benzyloxycarbonyl; R¹ is alkyl or a protecting group such as tert-butoxycarbonyl, benzyloxycarbonyl orp-toluenesulfonyl; and R⁸, R⁹, R¹⁰, R¹¹, R¹² and R¹³ are each independently selected from H or optionally substituted alkyl) can be prepared by treating compounds of formula 3 (wherein R⁵ is alkyl, acyl or a protecting group such as tert-butoxycarbonyl or benzyloxycarbonyl and R¹ is alkyl or a protecting group such as tert-butoxycarbonyl, benzyloxycarbonyl orp-toluenesulfonyl) under heated conditions with a catalyst such as copper iodide, a ligand such as trans-1,2-diaminocyclohexane or 8-hydroxyquinoline, a base such as potassium carbonate, cesium carbonate or potassium phosphate and compounds of formula 12 (wherein B is aryl, heteroaryl or cycloalkyl; R², R³, R⁴ are each independently selected from H, —O-alkyl, —S-alkyl, alkyl, halo, —CF₃, and —CN; L is —CH₂—O—, —CH═CH—, —CH₂CH₂—, or a bond; and Y is CH or N). Removal of the N2-protecting group R⁵ followed by reductive amination or alkylation can provide compounds of formula 18, wherein R⁵ is an optionally substituted alkyl group.

Alternatively, following deprotection, N2 can be acylated to give compounds of formula 18 wherein R⁵ is —C(═O)—R⁶ or —C(═O)—O—R⁷, and R⁶ and R⁷ are each optionally substituted alkyl or optionally substituted heterocycle. Additionally, in the case where R¹ is a protecting group, the protecting group can be removed to give compounds of formula 18 wherein R¹ is H.

Alternatively, following removal of the R¹ protecting group, N5 can be alkylated to give compounds of formula 18 wherein R⁵ is an optionally substituted alkyl.

Compounds of formula 20 (wherein Y is CH or N; R¹⁴ is H or halogen; R⁵ is alkyl, acyl or a protecting group such as tert-butoxycarbonyl or benzyloxycarbonyl; R¹ is alkyl or a protecting group such as tert-butoxycarbonyl, benzyloxycarbonyl orp-toluenesulfonyl; and R⁸, R⁹, R¹⁰, R¹¹, R¹² and R¹³ are each independently selected from H or optionally substituted alkyl) can be treated with hydrogen and a catalyst such as palladium on carbon to provide compounds of formula 21. The hydroxyl group on compounds of formula 21 can be converted to an appropriate activating group to give compounds of formula 22. In the case where Z² is triflate, compounds of formula 21 can be treated with trifluoromethylsulfonic anhydride or N-phenyl trifluoromethanesulfonamide and a base such as pyridine or lithium bis(trimethylsilyl)amide under cooled conditions to give compounds of formula 22. Treatment of compounds of formula 22 with compounds of formula 10 (wherein B is aryl or heteroaryl; R², R³, R⁴ are each independently selected from H, —O-alkyl, —S-alkyl, alkyl, halo, —CF₃, and —CN; Z¹=—CH═CH—B(OR¹⁷)₂, B(OH)₂, B(OR¹⁷)₂, SnR¹⁷ ₃ or the like and R¹⁷=alkyl), a catalyst such as palladium(0), and a base such as potassium carbonate under heated conditions can provide compounds of formula 18, wherein L is —CH═CH— or a direct bond. In the case where L is —CH═CH—, compounds of formula 18 can be treated with palladium on carbon under an atmosphere of hydrogen to give compounds of formula 18, where L is —CH₂CH₂—.

Compounds of formula 23 (wherein Y is CH or N; R¹⁴ is H or halogen; R⁵ is alkyl, acyl or a protecting group such as tert-butoxycarbonyl or benzyloxycarbonyl; R¹ is alkyl or a protecting group such as tert-butoxycarbonyl, benzyloxycarbonyl orp-toluenesulfonyl; and R⁸, R⁹, R¹⁰, R¹¹, R¹² and R¹³ are each independently selected from H or optionally substituted alkyl) can be treated with hydrogen and a catalyst such as palladium on carbon to provide compounds of formula 24. The hydroxyl group on compounds of formula 24 can be converted to an appropriate activating group to give compounds of formula 25. In the case where Z² is triflate, compounds of formula 24 can be treated with trifluoromethylsulfonic anhydride or N-phenyl trifluoromethanesulfonamide and a base such as pyridine or lithium bis(trimethylsilyl)amide under cooled conditions to give compounds of formula 25.

Treatment of compounds of formula 25 with compounds of formula 10 (wherein B is aryl or heteroaryl; R², R³, R⁴ are each independently selected from H, —O-alkyl, —S-alkyl, alkyl, halo, —CF₃, and —CN; Z¹=—CH═CH—B(OR¹⁷)₂, B(OH)₂, B(OR¹⁷)₂, SnR¹⁷ ₃ or the like and R¹⁷=alkyl), a catalyst such as palladium(0), and a base such as potassium carbonate under heated conditions can provide compounds of formula 19, wherein L is —CH═CH— or a direct bond.

In the case where L is —CH═CH—, compounds of formula 18 can be treated with palladium on carbon under an atmosphere of hydrogen to give compounds of formula 18, where L is —CH₂CH₂—.

Compounds of formula 26 (wherein B is aryl or heteroaryl; R², R³, R⁴ are each independently selected from H, —O-alkyl, —S-alkyl, alkyl, halo, —CF₃, and —CN; L is —CH₂—O—, —CH═CH—, —CH₂CH₂—, or a bond; G is —CR¹²R¹³—NH— or —NH—CR¹²R¹³—; R¹ is alkyl; and R⁸, R⁹, R¹⁰, R¹¹, R¹² and R¹³ are each independently selected from H or optionally substituted alkyl) can be treated under halogenation conditions such as 2-bromopropane under heated conditions to provide compounds of formula 27 wherein R¹⁵ is a halogen such as bromine.

EXAMPLES

Unless otherwise noted, reagents and solvents were used as received from commercial suppliers. Proton nuclear magnetic resonance (NMR) spectra were obtained on Bruker spectrometers at 300, 400 or 500 MHz. Spectra are given in ppm (δ) and coupling constants, J, are reported in Hertz. Tetramethylsilane (TMS) was used as an internal standard. Mass spectra were collected using either a Finnigan LCQ Duo LCMS ion trap electrospray ionization (ESI) or a mass Varian 1200L single quadrapole mass spectrometer (ESI). High performance liquid chromatograph (HPLC) analyses were obtained using a Luna C18(2) column (250×4.6 mm, Phenomenex) or a Gemini C18 column (250×4.6 mm, Phenomenex) with UV detection at 254 nm or 223 nm using a standard solvent gradient program (Method A or Method B).

Method A:

Time Flow (min) (mL/min) % A % B 0.0 1.0 90.0 10.0 20 1.0 10.0 90.0 25 1.0 10.0 90.0 A = Water with 0.025% Trifluoroacetic Acid B = Acetonitrile with 0.025% Trifluoroacetic Acid

Method B:

Time Flow (min) (mL/min) % A % B 0.0 1.0 98.0 2.0 25 1.0 10.0 90.0 30 1.0 10.0 90.0 A = Water with 0.025% Trifluoroacetic Acid B = Acetonitrile with 0.025% Trifluoroacetic Acid

Example 1 Preparation of 4-(Benzyloxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) tert-Butyl 7-bromo-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

3-Bromophenylhydrazine (40.0 g, 0.179 mol) and N-Boc-4-oxo-piperidine (35.4 g, 0.179 mol) were dissolved in ethanol (368 mL), and conc. HCl (72 mL) was added. The reaction mixture was then heated to reflux for 18 h, concentrated and basified using 10% NH₄OH in methanol (10%, 100 mL). The solvent was removed, and the residue was suspended in CH₂Cl₂ (1.2 L). Boc₂O (39.2 g, 0.179 mol) followed by DMAP (195 mg, 1.6 mmol) and triethylamine (46.4 mL, 0.358 mol) were then added, and the reaction progressed at room temperature for 18 h. The mixture was washed with 0.5N HCl, and the organic phase was removed, dried over Na₂SO₄, filtered and concentrated to dryness. The resulting mixture of regioisomers was purified by flash column chromatography (silica gel, hexanes/EtOAc, 100:0 to 80:20 to 50:50 then 25:75) to give the more polar title compound (26.2 g, 42%) as a yellow solid: ¹H NMR (300 MHz, CDCl₃) δ 8.16 (br s, 1H), 7.42 (s, 1H), 7.28 (d, J=8.1 Hz, 1H, partially masked by solvent), 7.18 (d, J=8.1 Hz, 1H), 4.60 (s, 2H), 3.80 (t, J=5.5 Hz, 2H), 2.79 (t, J=5.6 Hz, 2H), 1.51 (s, 9H).

b) tert-Butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

Sodium hydride (60% weight dispersion in mineral oil, 4.19 g, 0.105 mol) was added portionwise to a solution of tert-butyl 7-bromo-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (23.6 g, 0.07 mol) in DMF (300 mL) at room temperature under N₂. After 1 h, methyl iodide (14.8 g, 6.47 mL, 0.105 mol) was added, and the reaction was allowed to proceed for an additional 2 h. The mixture was quenched with H₂O, upon which a solid precipitated out of solution. The suspension was therefore diluted to 2 L with H₂O and filtered. The solids were washed thoroughly with water, then dissolved in CH₂Cl₂, dried over Na₂SO₄, filtered and concentrated to dryness. This provided the title compound (22.4 g, 91%) as a yellow solid: ¹H NMR (300 MHz, CDCl₃) δ 7.41 (s, 1H), 7.30 (d, J=8.3 Hz, 1H), 7.17 (d, J=8.4 Hz, 1H), 4.60 (s, 2H), 3.81 (br t, 2H), 3.58 (s, 3H), 2.77 (t, J=5.4 Hz, 2H), 1.50 (s, 9H).

c) tert-Butyl 7-(4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

tert-Butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carbox-ylate (7.0 g, 19 mmol), 4-benzyloxypyridone (3.85 g, 19.2 mmol), K₂CO₃ (2.91 g, 21.1 mmol) and 8-hydroxyquinoline (418 mg, 2.88 mmol) were suspended in DMSO (50 mL) and the air removed under vacuum for 15 min. The system was then flushed with N₂. This process was repeated and then copper iodide (547 mg, 2.88 mmol) was added. The evacuation/N₂ flushing process was repeated twice more, and the reaction mixture was heated to 100-120° C. for 18 h. The mixture was cooled, partitioned between EtOAc and sat. NH₄Cl and the organic phase removed, dried over Na₂SO₄, filtered and concentrated to dryness. Purification by flash column chromatography (silica gel, CH₂Cl₂/MeOH, 100:0 to 98:2 to 95:5 to 92:8 then 90:10) gave the title compound (4.71 g, 51%) as a yellow solid: ¹H NMR (300 MHz, CDCl₃) δ 7.50 (d, J=8.2 Hz, 1H), 7.43-7.35 (m, 5H), 7.32-7.29 (m, 2H), 7.01 (d, J=7.9 Hz, 1H), 6.10-6.03 (m, 2H), 5.06 (s, 2H), 4.64 (s, 2H), 3.89 (br t, 2H), 3.63 (s, 3H), 2.82 (br t, 2H), 1.50 (s, 9H).

d) 4-(Benzyloxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

tert-Butyl 7-(4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (12.0 g, 24.7 mmol) was dissolved in MeOH (100 mL), and 2N HCl in Et₂O (300 mL) was added. The reaction was allowed to proceed for 18 h. The mixture was concentrated, and the residue was partitioned between CH₂Cl₂ and sat. Na₂CO₃ solution. The organic phase was removed, and the aqueous phase was back extracted with CH₂Cl₂. The combined organic extracts were dried over Na₂SO₄, filtered and concentrated to dryness providing the free base of the title compound (8.1 g, 85%) as a yellow solid. A portion of the free base was converted to the HCl salt for biological testing. Free base: ¹H NMR (500 MHz, CDCl₃) δ 7.47-7.34 (m, 6H), 7.32-7.28 (m, 2H), 6.98 (d, J=7.1 Hz, 1H), 6.07 (d, J=2.6 Hz, 1H), 6.04 (dd, J=7.5, 2.6 Hz, 1H), 5.05 (s, 2H), 4.15 (s, 2H), 3.61 (s, 3H), 3.34 (br s, 2H), 2.78 (br s, 2H). HCl salt: melting point (mp) 296-302° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.61-7.57 (2×d, 2H), 7.47-7.46 (m, 3H), 7.43-7.40 (m, 2H), 7.37-7.34 (m, 1H), 7.05 (dd, J=8.3, 1.7 Hz, 1H), 6.33 (dd, J=7.5, 2.7 Hz, 1H), 6.16 (d, J=2.6 Hz, 1H), 5.19 (s, 2H), 4.57 (s, 2H), 3.73 (s, 3H), 3.67 (t, J=6.2 Hz, 2H), 3.20 (t, J=6.1 Hz, 2H); ESI MS m/z 386 [M+H]⁺; HPLC (Method A) 95.7% (AUC), t_(R)=13.6 min.

Example 2 Preparation of 4-(Benzyloxy)-1-(2,5-dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

4-(Benzyloxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (8.1 g, 21.0 mmol) and 37% aqueous formaldehyde (2.56 mL, 31.5 mmol) were dissolved in MeOH (200 mL) and stirred at room temperature for 2 h. Sodium triacetoxyborohydride (8.9 g, 42.0 mmol) was then added, and the reaction was stirred at room temperature for an additional 1 h. The mixture was concentrated, and the residue was partitioned between CH₂Cl₂ and sat. Na₂CO₃ solution. The organic phase was removed and the aqueous phase was back extracted with CH₂Cl₂. The combined organics were dried over Na₂SO₄, filtered and concentrated to dryness. Purification by column chromatography (120 g ISCO column eluting with methylene chloride and a methanol/ammonia mixture (10:1); gradient 100% methylene chloride to 85% methylene chloride over 60 min) provided the free base of the title compound. This was converted to the HCl salt using 2N HCl in Et₂O providing the title compound (5.57 g, 61%) as a yellow solid: mp 268-274° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.57 (dd, J=7.6, 1.7 Hz, 2H), 7.47-7.46 (m, 3H) 7.43-7.34 (m, 3H), 7.06 (dd, J=8.4, 1.9 Hz, 1H), 6.29 (dd, J=7.6, 2.7 Hz, 1H), 6.13 (d, J=2.6 Hz, 1H), 5.18 (s, 2H), 4.75 (d, J=14.3 Hz, 1H), 4.38 (d, J=14.2 Hz, 1H), 3.90 (m, 1H), 3.73 (s, 3H), 3.64-3.58 (m, 1H), 3.29-3.26 (m, 2H, partially masked by solvent), 3.13 (s, 3H); ESI MS m/z 400 [M+H]⁺; HPLC (Method B) 97.4% (AUC), t_(R)=14.7 min.

Example 3 Preparation of 4-(Benzyloxy)-1-(2-(2-hydroxyethyl)-5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride

4-(Benzyloxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (75 mg, 0.16 mmol), 2-iodoethanol (17 μL, 36 mg, 0.21 mmol) and triethylamine (105 μL, 0.82 mmol) were dissolved in MeCN (2 mL) and heated to reflux for 3 h. The mixture was then concentrated and purified by flash column chromatography (4 g ISCO column eluting with methylene chloride and a methanol/ammonia mixture (10:1); gradient 100% methylene chloride to 85% methylene chloride over 30 min) providing the free base. This was converted to the HCl salt (2N HCl/Et₂O) providing the title compound (22 mg, 27%) as a yellow solid: mp 162-168° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.63 (dd, J=7.6, 2.0 Hz, 2H), 7.51-7.50 (m, 3H) 7.46-7.43 (m, 2H), 7.41-7.38 (m, 1H), 7.09 (dd, J=8.3, 1.7 Hz, 1H), 6.36 (dd, J=7.6, 2.7 Hz, 1H), 6.18 (d, J=2.7 Hz, 1H), 5.23 (s, 2H), 4.82 (d, 1H, partially masked by solvent), 4.520 (d, J=14.3 Hz, 1H), 4.06-4.02 (m, 3H), 3.77 (s, 3H), 3.70-3.68 (m, 1H), 3.55-3.51 (m, 2H), 3.33-3.31 (m, 2H, partially masked by solvent); ESI MS m/z 430 [M+H]⁺; HPLC (Method B) 95.1% (AUC), t_(R)=12.4 min.

Example 4 Preparation of 4-(Benzyloxy)-1-(5-methyl-2-(2-(pyrrolidin-1-yl)acetyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride a) 4-(Benzyloxy)-1-(2-(2-chloroacetyl)-5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one

4-(Benzyloxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (75 mg, 0.16 mmol) was dissolved in a mixture of CH₂Cl₂ (1 mL) and sat. NaHCO₃ solution (1 mL) and chloroacetyl chloride (28 mg, 0.25 mmol) was added. The reaction mixture was vigorously stirred for 1 h then the phases were separated. The aqueous phase was extracted with CH₂Cl₂ and the combined organic extracts were dried over Na₂SO₄, filtered and concentrated to dryness providing the title compound (74 mg, 97%) as a beige solid which was a mixture of rotamers: ESI MS m/z 462 [M+H]⁺.

b) 4-(Benzyloxy)-1-(5-methyl-2-(2-(pyrrolidin-1-yl)acetyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride

4-(Benzyloxy)-1-(2-(2-chloroacetyl)-5-methyl-2, 3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (70 mg, 0.15 mmol) was dissolved in MeCN (0.5 mL) and pyrrolidine (54 mg, 0.76 mmol) was added. The reaction mixture was refluxed for 2 h, concentrated and the residue purified by preparative HPLC. The fractions were concentrated, and the residue was converted to the free base by partitioning between CH₂Cl₂ and sat. Na₂CO₃ solution. The organic phase was removed, and the aqueous layer was extracted with CH₂Cl₂. The combined organic extracts were dried over Na₂SO₄, filtered and concentrated to dryness. Conversion to the HCl salt (2N HCl/Et₂O) provided the title compound (74 mg, 97%) as a beige solid: ¹H NMR (500 MHz, CD₃OD) δ 7.62 (dd, J=7.7, 1.9 Hz, 1H), 7.53 (d, J=8.0 Hz, 1H) 7.46-7.44 (m, 2H), 7.41-7.35 (m, 4H), 7.06 (dd, J=8.0, 1.7 Hz, 1H), 6.36 (d, J=7.6 Hz, 1H), 6.18 (s, 1H), 5.25 (s, 2H), 4.90 (m, 1H, masked by solvent), 4.82 (s, 1H), 4.53 (d, J=14.2 Hz, 2H), 4.09 (t, J=6.5 Hz, 1H), 3.91 (t, J=6.4 Hz, 1H), 3.89-3.86 (m, 2H), 3.77 (s, 3H), 3.20-3.18 (m, 2H), 3.05-3.03 (m, 1H), 2.99-2.97 (m, 1H), 2.12-2.10 (m, 2H), 2.08-2.05 (m, 2H); ESI MS m/z 497 [M+H]⁺; HPLC (Method B) 95.0% (AUC), t_(R)=13.1 min.

Example 5 Preparation of 4-(Benzyloxy)-1-(5-methyl-2-(2,2,2-trifluoroethyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride

4-(Benzyloxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (75 mg, 0.16 mmol) and triethylamine (105 μL, 0.753 mmol) were dissolved in MeCN (2 mL) and 1,1,1-trifluoro-2-bromoethane (32 mg, 0.20 mmol) was added. The reaction mixture was heated to reflux for 4 h, but no reaction occurred. The mixture was concentrated, DMF (2 mL) and NaI (5 mg) were added, and the reaction mixture was heated to reflux. Again, no reaction occurred. 1,1,1-trifluoroethyl triflate (76 mg, 0.328 mmol) was then added, and the mixture was heated to reflux. After 1.5 h, the mixture was concentrated and purified by flash column chromatography (4 g ISCO column eluting with methylene chloride and a methanol/ammonia mixture (10:1); gradient 100% methylene chloride to 85% methylene chloride over 30 min). Further purification by preparative HPLC, followed by conversion to the HCl salt (2N HCl/Et₂O) provided the title compound (6 mg, 7%) as a white solid: ¹H NMR (300 MHz, CD₃OD) δ 7.48 (d, J=7.5 Hz, 1H), 7.40-7.24 (m, 7H), 6.87 (dd, J=8.3, 1.9 Hz, 1H), 6.19 (dd, J=7.6, 2.7 Hz, 1H), 6.03 (d, J=2.7 Hz, 1H), 5.08 (s, 2H), 3.96 (s, 2H), 3.58 (s, 3H), 3.37 (q, J=9.7 Hz, 2H), 3.15-3.14 (m, 2H, partially masked by solvent), 2.87 (t, J=5.5 Hz, 2H); ESI MS m/z 468 [M+H]⁺; HPLC (Method B) 98.9% (AUC), t_(R)=17.3 min.

Example 6 Preparation of 4-(Benzyloxy)-1-(5-methyl-2-(3,3,3-trifluoropropyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride

4-(Benzyloxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (63 mg, 0.14 mmol) and K₂CO₃ (97 mg, 0.70 mmol) were suspended in DMF (1 mL) and 1,1,1-trifluoro-3-bromopropane (50 mg, 0.28 mmol) was added. The reaction mixture was heated to 80° C. for 18 h, cooled and partitioned between ethyl acetate and water. The aqueous phase was removed and the organic phase washed with 5% LiCl (5×), dried over Na₂SO₄, filtered and concentrated to dryness. Purification by flash column chromatography (4 g ISCO column eluting with methylene chloride and a methanol/ammonia mixture (10:1); gradient 100% methylene chloride to 85% methylene chloride over 30 min) followed by conversion to the HCl salt (2N HCl/Et₂O) provided the title compound (12 mg, 16%) as a yellow solid: ¹H NMR (500 MHz, CD₃OD) δ 7.66 (d, J=8.3 Hz, 1H), 7.63 (d, J=7.6 Hz, 1H), 7.52-7.51 (m, 3H), 7.48-7.45 (m, 2H), 7.43 (d, J=7.2 Hz, 1H), 7.11 (dd, J=8.3, 1.7 Hz, 1H), 6.36 (dd, J=7.6, 2.7 Hz, 1H), 6.19 (d, J=2.7 Hz, 1H), 5.24 (s, 2H), 4.96 (m, 6H, masked by solvent), 3.79-3.74 (m, 5H), 3.03-3.02 (m, 2H); ESI MS m/z 482 [M+H]⁺; HPLC (Method B) 95.6% (AUC), t_(R)=14.3 min.

Example 7 Preparation of 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(4-(trifluoromethyl)benzyloxy)pyridin-2(1H)-one dihydrochloride a) tert-Butyl 5-methyl-7-(2-oxo-4-(4-(trifluoromethyl)benzyloxy)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

The compound was prepared from tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (250 mg, 0.701 mmol) and 4-(4-(trifluoromethyl)benzyloxy)pyridin-2(1H)-one (142 mg, 0.526 mmol) according to the procedure in Example 1 (step c). Purification by flash column chromatography (silica gel, hexanes/EtOAc, 100:0 to 80:20 to 50:50 to 25:75 then 0:100) provided the title compound (73 mg, 19%) as a solid, that contained an impurity: ESI MS m/z 554 [M+H]⁺.

b) 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(4-(trifluoromethyl)benzyloxy)pyridin-2(1H)-one dihydrochloride

tert-Butyl 5-methyl-7-(2-oxo-4-(4-(trifluoromethyl)benzyloxy)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (73 mg, 0.13 mmol) was dissolved in MeOH (0.5 mL) and 2N HCl in Et₂O (3 mL) was added. The reaction was allowed to proceed for 3 h. The mixture was concentrated and purified by preparative HPLC. Conversion to the HCl salt (2N HCl/Et₂O) provided the title compound (26 mg, 38%) as a yellow solid: mp 311-315° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.77 (d, J=8.3 Hz, 2H), 7.71 (d, J=8.2 Hz, 2H), 7.65 (d, J=7.6 Hz, 1H), 7.62 (d, J=8.3 Hz, 1H), 7.50 (s, 1H), 7.09 (dd, J=8.3, 1.8 Hz, 1H), 6.38 (dd, J=7.6, 2.7 Hz, 1H), 6.17 (d, J=2.7 Hz, 1H), 5.33 (s, 2H), 4.51 (s, 2H), 3.77 (s, 3H), 3.71 (t, J=6.2 Hz, 2H), 3.24 (t, J=6.1 Hz, 2H); ESI MS m/z 454 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=14.2 min.

Example 8 Preparation of 4-(4-Chlorobenzyloxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride a) tert-Butyl 7-(4-(4-chlorobenzyloxy)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

The compound was prepared from tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (200 mg, 0.548 mmol) and 4-(4-chlorobenzyloxy)pyridin-2(1H)-one (129 mg, 0.548 mmol) according to the procedure in Example 1 (step c). Purification by flash column chromatography (silica gel, hexanes/EtOAc, 100:0 to 80:20 to 50:50 to 25:75 then 0:100) provided the title compound (143 mg, 50%) as a yellow solid: ¹H NMR (300 MHz, CDCl₃) δ 7.51 (d, J=8.0 Hz, 1H), 7.43-7.29 (m, 6H), 7.01 (d, J=7.9 Hz, 1H), 6.05-6.02 (m, 2H), 5.02 (s, 2H), 4.64 (br s, 2H), 3.84 (br s, 2H), 3.63 (s, 3H), 2.82 (br s, 2H), 1.50 (s, 9H).

b) 4-(4-Chlorobenzyloxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride

tert-Butyl-7-(4-(4-chlorobenzyloxy)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (143 mg, 0.275 mmol) was dissolved in MeOH (1 mL) and 2N HCl in Et₂O (5 mL) was added. The reaction was allowed to proceed for 3 h. The resulting precipitate was collected by filtration and washed with Et₂O to provide the title compound (95 mg, 71%) as a yellow solid: mp 305-310° C. dec; ¹H NMR (500 MHz, DMSO-d₆) δ 9.54 (br s, 2H), 7.57 (m, 2H), 7.51 (s, 5H), 6.99 (d, J=7.8 Hz, 1H), 6.12 (dd, J=7.8, 2.7 Hz, 1H), 5.99 (d, J=2.7 Hz, 1H), 5.16 (s, 2H), 4.33 (br s, 2H), 3.68 (s, 3H), 3.52-3.48 (m, 2H), 3.12-3.08 (m, 2H); ESI MS m/z 420 [M+H]⁺; HPLC (Method B) 97% (AUC), t_(R)=13.99 min.

Example 9 Preparation of 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-phenethylpyridin-2(1H)-one dihydrochloride a) tert-Butyl 5-methyl-7-(2-oxo-4-phenethylpyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

The compound was prepared from tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (200 mg, 0.548 mmol) and 4-phenethylpyridin-2(1H)-one (109 mg, 0.548 mmol) according to the procedure in Example 1 (step c). Purification by flash column chromatography (silica gel, hexanes/EtOAc, 100:0 to 80:20 to 50:50 to 25:75 then 0:100) provided the title compound (126 mg, 48%) as a yellow solid: ¹H NMR (300 MHz, CDCl₃) δ 7.52 (d, J=8.2 Hz, 1H), 7.34-7.30 (m, 4H), 7.24-7.20 (m, 3H, partially masked by solvent), 7.03 (d, J=7.8 Hz, 1H), 6.52 (s, 1H), 6.10 (dd, J=7.9, 1.7 Hz, 1H), 4.65 (br s, 2H), 3.84 (br s, 2H), 3.63 (s, 3H), 2.98-2.93 (m, 2H), 2.84-2.81 (m, 4H), 1.51 (s, 9H).

b) 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-phenethylpyridin-2(1H)-one dihydrochloride

tert-Butyl 5-methyl-7-(2-oxo-4-phenethylpyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (120 mg, 0.248 mmol) was dissolved in MeOH (1.5 mL) and 2N HCl in Et₂O (5 mL) was added. The reaction was allowed to proceed for 3 h. The resulting precipitate was collected by filtration and washed with Et₂O to provide the title compound (90 mg, 80%) as a yellow solid: mp 282-286° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.70 (d, J=6.9 Hz, 1H), 7.62 (d, J=8.3 Hz, 1H), 7.52 (s, 1H), 7.33-7.26 (m, 4H), 7.22 (t, J=7.2 Hz, 1H), 7.09 (dd, J=8.3, 1.6 Hz, 1H), 6.59-6.56 (m, 2H), 4.50 (s, 2H), 3.76 (s, 3H), 3.70 (t, J=6.2 Hz, 2H), 3.24 (t, J=6.0 Hz, 2H), 3.04-3.01 (m, 2H), 2.98-2.95 (m, 2H); ESI MS m/z 384 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=13.3 min.

Example 10 Preparation of 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(4-(trifluoromethyl)phenyl)pyridin-2(1H)-one dihydrochloride a) tert-Butyl 5-methyl-7-(2-oxo-4-(4-(trifluoromethyl)phenyl)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

The compound was prepared from tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (153 mg, 0.418 mmol) and 4-(4-(trifluoromethy)phenyl)pyridine-2(1H)-one (100 mg g, 0.418 mmol) according to the procedure in Example 1 (step c). Purification by flash column chromatography (silica gel, hexanes/EtOAc, 100:0 to 80:20 to 50:50 to 25:75 then 0:100) provided the title compound (98 mg, 45%) as a yellow/green solid: ¹H NMR (500 MHz, CDCl₃) δ 7.75 (s, 4H), 7.57-7.53 (m, 2H), 7.37 (s, 1H), 7.09 (d, J=8.0 Hz, 1H), 6.92 (s, 1H), 6.50 (d, J=6.7 Hz, 1H), 4.67 (s, 2H), 3.86 (br s, 2H), 3.60 (s, 3H), 2.84 (br s, 2H), 1.51 (s, 9H).

b) 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(4-(trifluoromethyl)phenyl)pyridin-2(1H)-one dihydrochloride

tert-Butyl 5-methyl-7-(2-oxo-4-(4-(trifluoromethyl)phenyl)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (95 mg, 0.18 mmol) was dissolved in MeOH (2 mL) and 2N HCl in Et₂O (10 mL) was added. The reaction was allowed to proceed for 3 h. The resulting precipitate was collected by filtration and washed with Et₂O to provide the title compound (45 mg, 50%) as a pale yellow solid: mp 318-323° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.95 (d, J=8.2 Hz, 2H), 7.84 (d, J=8.2 Hz, 2H), 7.81 (d, J=7.1 Hz, 1H), 7.63 (d, J=8.3 Hz, 1H), 7.57 (s, 1H), 7.14 (dd, J=8.3, 1.3 Hz, 1H), 6.96 (d, J=1.6 Hz, 1H), 6.87 (dd, J=7.1, 1.7 Hz, 1H), 4.50 (s, 2H), 3.76 (s, 3H), 3.68 (t, J=6.1 Hz, 2H), 3.22 (t, J=6.1 Hz, 2H); ESI MS m/z 424 [M+H]⁺; HPLC (Method B) 97.6% (AUC), t_(R)=13.9 min.

Example 11 Preparation of 4-(4-Chlorophenyl)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride a) 4-(4-Chlorophenyl)pyridine 1-oxide

Beilstein Registry Number 5510914

4-Chloropyridine-N-oxide (1.5 g, 12 mmol), 4-chlorophenylboronic acid (2.7 g, 17 mmol) and K₂CO₃ (4.78 g, 34.6 mmol) were suspended in DMSO (15 mL) and [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II) (PdCl₂(dppf)) (225 mg, 0.276 mmol) was added. The reaction mixture was placed under vacuum for 20 min and then flushed with N₂. This process was repeated, and the reaction mixture was heated to 120° C. for 3 h, cooled and partitioned between ethyl acetate and brine. The aqueous phase was removed, and the organic phase was washed with brine, dried over Na₂SO₄, filtered and concentrated to dryness. Purification by flash column chromatography (silica gel, hexanes/EtOAc, 100:0 to 80:20 to 50:50 then 25:75 followed by methylene chloride/MeOH 100:0 to 95:5 then 90:10) provided the title compound (1.05 g, 44%) as a grey solid: ¹H NMR (300 MHz, CDCl₃) δ 8.26 (d, J=7.1 Hz, 2H), 7.58-7.43 (m, 6H).

b) 4-(4-Chlorophenyl)pyridin-2(1H)-one

4-(4-Chlorophenyl)pyridine 1-oxide (1.04 g, 5.07 mmol) and acetic anhydride (25 mL) were heated to reflux for 24 h. The mixture was then concentrated, and 1N NaOH (10 mL) in MeOH (10 mL) was added. The reaction mixture was heated to reflux for 1 h, then cooled, concentrated, and purified by flash column chromatography (silica gel, methylene chloride/MeOH 100:0 to 98:2 to 95:5 then 90:10) providing the title compound (500 mg, 48%) as an off-white solid: ¹H NMR (300 MHz, CDCl₃) δ 11.64 (s, 1H), 7.73 (d, J=8.6 Hz, 2H), 7.54 (d, J=8.6 Hz, 2H), 7.46 (d, J=6.8 Hz, 1H), 6.60 (d, J=1.4 Hz, 1H), 6.50 (dd, J=6.9, 1.8 Hz, 1H).

c) tert-Butyl 7-(4-(4-chlorophenyl)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

The compound was prepared from tert-Butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (250 mg, 0.685 mmol) and 4-(4-chlorophenyl)pyridine-2(1H)-one (100 mg, 0.418 mmol) according to the procedure in Example 1 (step c). Purification by flash column chromatography (silica gel, hexanes/EtOAc, 100:0 to 80:20 to 50:50 to 25:75 then 0:100) provided the title compound (59 mg, 18%) as a solid, that contained an impurity: ESI MS m/z 490 [M+H]⁺.

d) 4-(4-Chlorophenyl)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride

tert-Butyl 7-(4-(4-chlorophenyl)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (59 mg, 0.12 mmol) was dissolved in MeOH (0.5 mL) and 2N HCl in Et₂O (3 mL) was added. The reaction was allowed to proceed for 3 h. The mixture was concentrated and purified by preparative HPLC. Conversion to the HCl salt (2N HCl in Et₂O) provided the title compound (22 mg, 40%) as a pale yellow solid: ¹H NMR (500 MHz, CD₃OD) δ 7.80-7.78 (m, 3H), 7.66 (d, J=8.5 Hz, 1H), 7.58-7.57 (m, 3H), 7.16 (dd, J=8.3, 1.7 Hz, 1H), 6.94 (d, J=1.8 Hz, 1H), 6.87 (dd, J=7.1, 1.9 Hz, 1H), 6.17 (d, J=2.7 Hz, 1H), 4.53 (s, 2H), 3.79 (s, 3H), 3.72 (t, J=5.9 Hz, 2H), 3.25 (t, J=5.9 Hz, 2H); ESI MS m/z 390 [M+H]⁺; HPLC (Method B) 98.2% (AUC), t_(R)=16.3 min.

Example 12 Preparation of 4-(2,4-Dichlorophenyl)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride a) tert-Butyl 7-(4-(2,4-dichlorophenyl)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

The compound was prepared from tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (200 mg, 0.548 mmol) and 4-(2,4-dichlorophenyl)pyridine-2(1H)-one (132 mg, 0.548 mmol) according to the procedure in Example 1 (step c). Purification by flash column chromatography (silica gel, hexanes/EtOAc, 100:0 to 80:20 to 50:50 then 25:75) provided the title compound (56 mg, 20%) as a yellow solid: ¹H NMR (500 MHz, CDCl₃) δ 7.56-7.52 (m, 2H), 7.47 (d, J=7.0 Hz, 1H), 7.39-7.32 (m, 3H), 7.10 (br s, 1H), 6.69 (s, 1H), 6.35 (d, J=5.7 Hz, 1H), 4.66 (s, 2H), 3.85 (br s, 2H), 3.65 (s, 3H), 2.84 (br s, 2H), 1.51 (s, 9H).

b) 4-(2,4-Dichlorophenyl)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride

tert-Butyl 7-(4-(2,4-dichlorophenyl)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (56 mg, 0.11 mmol) was dissolved in MeOH (1 mL) and 2N HCl in Et₂O (5 mL) was added. The reaction was allowed to proceed for 3 h. The mixture was concentrated and purified by preparative HPLC. Conversion to the HCl salt (2N HCl in Et₂O) provided the title compound (22 mg, 42%) as a yellow solid: mp 321-324° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.80 (d, J=7.0 Hz, 1H), 7.70 (s, 1H), 7.68 (d, J=7.9 Hz, 1H), 7.62 (s, 1H), 7.54 (s, 2H), 7.13 (d, J=7.0 Hz, 1H), 6.73 (s, 1H), 6.61 (d, J=7.2 Hz, 1H), 4.54 (s, 2H), 3.80 (s, 3H), 3.72 (t, J=6.0 Hz, 2H), 3.26 (t, J=5.9 Hz, 2H); ESI MS m/z 424 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=14.1 min.

Example 13 Preparation of 4-(Benzyloxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-8-yl)pyridin-2(1H)-one hydrochloride a) tert-Butyl 8-bromo-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

To a mixture of 4-bromophenylhydryzine hydrochloride (1.00 g, 4.47 mmol) and tert-butyl 4-oxopiperidine-1-carboxylate (0.89 g, 4.5 mmol) were added EtOH (10 mL) and conc. HCl (3 mL). The reaction mixture was heated to 90° C. and stirred at 90° C. until the reaction was complete. Then the mixture was concentrated and the residue was dissolved in CH₂Cl₂ (10 mL) and CH₃OH (5 mL). To the above solution were added Boc₂O (1.46 g, 6.69 mmol), TEA (0.94 mL, 6.7 mmol) and DMAP (55 mg, 0.45 mmol). The reaction mixture was stirred at room temperature until it was complete. The mixture was concentrated and the residue was dissolved in CH₂Cl₂, washed with H₂O and brine, dried with Na₂SO₄, filtered and concentrated. Purification by flash column chromatography (silica gel, hexanes/EtOAc, 1:1) gave the title compound (1.12 g, 72%) as a yellow foam: ¹H NMR (500 MHz, CDCl₃) δ 7.89 (br s, 1H), 7.57 (s, 1H), 7.17-7.24 (m, 2H), 4.58 (s, 2H), 3.81 (m, 2H), 2.83 (m, 2H), 1.5 (s, 9H); ESI MS m/z 351 [M+H]⁺.

b) tert-Butyl 8-4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2-(5H)-carboxylate

To a solution of tert-butyl 8-bromo-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (0.53 g, 1.5 mmol) in DMF (6 mL) was added NaH (60% weight dispersion in mineral oil, 91 mg, 2.3 mmol) and CH₃I (0.14 mL, 2.3 mmol). The reaction mixture was stirred at room temperature until the reaction was complete. Then the reaction was quenched with H₂O and extracted with CH₂Cl₂. The organic layer was washed with H₂O and 5% LiCl, dried with Na₂SO₄, filtered and concentrated to give tert-butyl 8-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate, which was used directly without purification.

To a mixture of tert-butyl 8-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (0.48 g, 1.3 mmol), 4-(benzyloxy)pyridin-2(1H)-one (264 mg, 1.31 mmol), 8-hydroxyquinoline (29 mg, 0.20 mmol), K₂CO₃ (217 mg, 1.57 mmol) and CuI (38 mg, 0.20 mmol) was added DMSO (5 mL). The reaction mixture was degassed and back-filled with N₂. The reaction mixture was heated to 130° C. and stirred at 130° C. overnight. After it was cooled, the mixture was filtered through a layer of Celite. The filtrate was diluted with CH₂Cl₂, washed with H₂O and 5% LiCl, dried with Na₂SO₄, filtered, and concentrated. Purification by flash column chromatography (silica gel, 5% CH₃OH in CH₂Cl₂) gave the title compound (0.28 g, 44%) as a yellow solid: ¹H NMR (500 MHz, CDCl₃) δ 7.36-7.29 (m, 8H), 7.13 (d, J=8.0 Hz, 1H), 6.09 (d, J=2.0 Hz, 1H), 6.03 (dd, J=7.5, 2.0 Hz, 1H), 5.05 (s, 2H), 4.61 (s, 2H), 3.84 (m, 2H), 3.66 (s, 3H), 2.82 (m, 2H), 1.49 (s, 9H); ESI MS m/z 486 [M+H]⁺.

c) 4-(Benzyloxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-8-yl)pyridin-2(1H)-one hydrochloride

To a solution of tert-butyl 8-4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2-(5H)-carboxylate (180 mg, 0.37 mmol) in CH₃OH (2 mL) was added 1N HCl in Et₂O (2 mL). The reaction mixture was stirred at room temperature until the reaction was complete. The resulting solid was dried under vacuum to give the title compound (142 mg, 91%) as a yellow solid: mp 280-285° C. (decompose); ¹H NMR (500 MHz, CD₃OD) δ 7.59 (d, J=7.5 Hz, 1H), 7.54 (d, J=9.0 Hz, 1H), 7.48-7.40 (m, 5H), 7.38-7.36 (m, 1H), 7.17 (dd, J=8.5, 1.5 Hz, 1H), 6.33 (dd, J=7.5, 2.5 Hz, 1H), 6.16 (d, J=2.5 Hz, 1H), 5.20 (s, 2H), 4.45 (s, 2H), 3.77 (s, 3H), 3.67 (t, J=6.0 Hz, 2H), 3.21 (t, J=6.0 Hz, 2H); ESI MS m/z 386 [M+H]⁺; HPLC (Method B) 98.8% (AUC), t_(R)=12.9 min.

Example 14 Preparation of 4-(Benzyloxy)-1-(2,5-dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-8-yl)pyridin-2(1H)-one hydrochloride

To a solution of 4-(benzyloxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-8-yl)pyridin-2(1H)-one (100 mg, 0.26 mmol) in CH₃OH (3 mL) was added formaldehyde (30 μL, 0.29 mmol) and NaBH(OAc)₃ (110 mg, 0.52 mmol). The reaction mixture was stirred at room temperature until the reaction was complete. Then the mixture was concentrated and the residue was dissolved in CH₂Cl₂. The organic layer was washed with H₂O and 5% LiCl, dried with Na₂SO₄, filtered and concentrated. Purification by flash column chromatography (silica gel, 10% CH₃OH in CH₂Cl₂) gave 4-(benzyloxy)-1-(2,5-dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-8-yl)pyridin-2(1H)-one (102 mg, 98%) as a yellow solid. The free base was converted to the HCl salt to give the title compound (100 mg, 90%) as a yellow solid: mp 264-268° C. (decompose); ¹H NMR (500 MHz, DMSO-d₆) δ 10.26 (s, 1H), 7.56-7.36 (m, 8H), 7.10 (dd, J=8.5, 1.5 Hz, 1H), 6.10 (dd, J=7.5, 3.0 Hz, 1H), 5.97 (d, J=3.0 Hz, 1H), 5.15 (s, 2H), 4.58 (m, 1H), 4.27 (m, 1H), 3.78 (m, 1H), 3.72 (s, 3H), 3.50 (m, 1H), 3.18 (m, 2H), 2.97 (s, 3H); ESI MS m/z 400 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=12.9 min.

Example 15 Preparation of 2-(Pyrrolidin-1-yl)ethyl-7-4-(benzyloxy)-2-oxopyridin-1(2H)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate hydrochloride

To a solution of 4-benzyloxy-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride (100 mg, 0.24 mmol) in DMSO (2 mL) was added 1-(2-chloroethyl)pyrrolidine hydrochloride (53 mg, 0.29 mmol) and Cs₂CO₃ (313 mg, 1.06 mmol). The reaction mixture was stirred at room temperature under Ar until the reaction was complete. The reaction was quenched with water and extracted with CH₂Cl₂. The organic layer was washed with H₂O and 5% LiCl, dried with Na₂SO₄, filtered, and concentrated. Purification by flash column chromatography (silica gel, 5% CH₃OH in CH₂Cl₂) gave 2-(pyrrolidin-1-yl)ethyl-7-4-(benzyloxy)-2-oxopyridin-1 (2H)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (56 mg, 44%) as a yellow foam. The free base was converted to the HCl salt to give the title compound (44 mg, 73%) as a yellow solid: mp 95-97° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.78-7.75 (m, 1H), 7.57-7.54 (m, 1H), 7.49-7.37 (m, 6H), 7.04-7.01 (m, 1H), 6.55-6.52 (m, 1H), 6.33-6.31 (m, 1H), 5.26 (s, 2H), 4.80-4.73 (m, 2H), 4.49-4.48 (m, 2H), 3.94-3.93 (m, 2H), 3.82-3.72 (m, 2H), 3.69 (s, 3H), 3.58-3.57 (m, 2H), 3.20-3.14 (m, 2H), 2.98-2.94 (m, 2H), 2.15-1.99 (m, 4H); ESI MS m/z 527 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=13.8 min.

Example 16 Preparation of 4-(Benzyloxy)-1-(2-(2-(dimethylamino)acetyl)-5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

To a solution of 4-benzyloxy-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (100 mg, 0.26 mmol) in CH₂Cl₂ (2 mL) was added 2-chloroacetyl chloride (29 μL, 0.36 mmol) and Et₃N (0.1 mL, 0.7 mmol). The reaction mixture was stirred at room temperature until the reaction was complete. After the solvent was removed, the residue was dissolved in DMF. To the DMF solution was added (CH₃)₂NH (64 μL, 1.2 mmol) and K₂CO₃ (166 mg, 1.2 mmol). The reaction mixture was heated to 70° C. and stirred at 70° C. until the reaction was complete. After it was cooled, the reaction was quenched with water and extracted with CH₂Cl₂. The organic layer was washed with H₂O and 5% LiCl, dried with Na₂SO₄, filtered, and concentrated. Purification by flash column chromatography (silica gel, 10% CH₃OH in CH₂Cl₂) gave 4-(benzyloxy)-1-(2-(2-(dimethyl amino)acetyl)-5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (58 mg, 51%) as a yellow foam. The free base was converted to the HCl salt to give the title compound (31 mg, 50%) as a yellow solid and as a mixture of rotamers: mp 135-140° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.75-7.71 (m, 1H), 7.59-7.55 (m, 1H), 7.49-7.37 (m, 6H), 7.05-7.01 (m, 1H), 6.49-6.45 (m, 1H), 6.28-6.26 (m, 1H), 5.24 (s, 2H), 4.87 (br s, 1H), 4.69 (br s, 1H), 4.44-4.41 (m, 2H), 4.11-4.07 (m, 1H), 3.85-3.82 (m, 1H), 3.70 (2×s, 3H), 3.06-2.92 (m, 2H), 2.97-2.94 (2×s, 6H); ESI MS m/z 471 [M+H]⁺; HPLC (Method B) 97.0% (AUC), t_(R)=13.2 min.

Example 17 Preparation of 4-(Benzyloxy)-1-(5-methyl-2-(2-oxo-2-(pyrrolidin-1-yl)ethyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridine-2(1H)-one hydrochloride

To a solution of 4-benzyloxy-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (100 mg, 0.26 mmol) in DMF (3 mL) was added 2-chloro-1-(pyrrolidin-1-yl)ethanone (77 mg, 0.52 mmol) and K₂CO₃ (72 mg, 0.52 mmol). The reaction mixture was heated to 70° C. and stirred at 70° C. until the reaction was complete. After it was cooled, the reaction was quenched with water and extracted with CH₂Cl₂. The organic layer was washed with H₂O and 5% LiCl, dried with Na₂SO₄, filtered, and concentrated. Purification by flash column chromatography (silica gel, 5% CH₃OH in CH₂Cl₂) gave 4-(benzyloxy)-1-(5-methyl-2-(2-oxo-2-(pyrrolidin-1-yl)ethyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridine-2(1H)-one (35 mg, 27%) as a yellow foam. The free base was converted to the HCl salt to the give title compound (30 mg, 80%) as a yellow solid: mp 162-166° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.60 (d, J=7.5 Hz, 1H), 7.56 (d, J=8.0 Hz, 1H), 7.49-7.35 (m, 6H), 7.06 (dd, J=8.5, 1.5 Hz, 1H), 6.33 (dd, J=7.5, 3.0 Hz, 1H), 6.16 (d, J=3.0 Hz, 1H), 5.20 (s, 2H), 4.80 (d, J=14.5 Hz, 1H), 4.54 (d, J=14.5 Hz, 1H), 4.36 (s, 2H), 4.00-3.98 (m, 1H), 3.75 (s, 3H), 3.68-3.65 (m, 1H), 3.54 (t, J=7.0 Hz, 2H), 3.49-3.45 (m, 2H), 3.35-3.33 (m, 2H), 2.05-1.92 (m, 4H); ESI MS m/z 497 [M+H]⁺; HPLC (Method B) 97.9% (AUC), t_(R)=13.4 min.

Example 18 Preparation of 4-(Benzyloxy)-1-(5-methyl-2-(3-(pyrrolidin-1-yl)propanoyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridine-2(1H)-one hydrochloride

To a solution of 4-benzyloxy-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (100 mg, 0.26 mmol) in DMF (3 mL) was added O-(7-azabenzotriazol-1-yl)-N,N,N′N′-tetramethyluronium hexafluorophosphate (HATU) (148 mg, 0.389 mmol), 3-(pyrrolidin-1-yl)propanoic acid hydrochloride (56 mg, 0.31 mmol), and Et₃N (73 μL, 0.52 mmol). The reaction mixture was stirred at room temperature under Ar until the reaction was complete. The reaction was quenched with water and extracted with CH₂Cl₂. The organic layer was washed with H₂O and 5% LiCl, dried with Na₂SO₄, filtered and concentrated. Purification by flash column chromatography (silica gel, 5% CH₃OH in CH₂Cl₂) gave 4-(benzyloxy)-1-(5-methyl-2-(3-(pyrrolidin-1-yl)propanoyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridine-2(1H)-one as a yellow foam. The free base was converted to the HCl salt to give the title compound (75 mg, 86%) as a yellow solid: mp 110-115° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.79-7.76 (m, 1H), 7.61-7.55 (m, 1H), 7.49-7.36 (m, 6H), 7.05-7.02 (m, 1H), 6.55-6.52 (m, 1H), 6.33-6.32 (m, 1H), 5.26 (s, 2H), 4.06 (t, J=5.5 Hz, 1H), 3.94 (t, J=5.5 Hz, 1H), 3.70-3.69 (m, 5H), 3.54-3.50 (m, 2H), 3.18-2.89 (m, 8H), 2.18-2.04 (m, 4H); ESI MS m/z 511 [M+H]⁺; HPLC (Method B) 97.7% (AUC), t_(R)=13.6 min.

Example 19 Preparation of 4-(Benzyloxy)-1-(5-methyl-2-(pyrrolidine-3-carbonyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

Following the procedure of Example 18, but substituting 1-(tert-butoxycarbonyl)pyrrolidine-3-carboxylic acid for 3-(pyrrolidin-1-yl)propanoic acid hydrochloride, a yellow solid was obtained in 78% yield (118 mg). The yellow solid was dissolved in CH₃OH (3 mL) and was treated with 1N HCl in Et₂O (2 mL). The resulting solid was isolated by filtration and dried under vacuum to give the title compound (90 mg, 90%) as a green-yellow powder: ¹H NMR (500 MHz, CD₃OD) δ 7.75-7.72 (m, 1H), 7.63-7.55 (m, 1H), 7.49-7.36 (m, 6H), 7.05-7.02 (m, 1H), 6.51-6.46 (m, 1H), 6.29-6.27 (m, 1H), 5.25 (s, 2H), 4.79-4.76 (m, 2H), 4.14-3.97 (m, 2H), 3.87-3.82 (m, 1H), 3.71-3.69 (m, 4H), 3.60-3.50 (m, 1H), 3.45-3.36 (m, 3H), 3.04-3.03 (m, 1H), 2.94-2.92 (m, 1H), 2.52-2.36 (m, 1H), 2.18-2.00 (m, 1H); ESI MS m/z 483 [M+H]⁺; HPLC (Method B) 98.1% (AUC), t_(R)=13.2 min.

Example 20 Preparation of (R)-4-(Benzyloxy)-1-(5-methyl-2-(pyrrolidine-2-carbonyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

Following the procedure of Example 19, but substituting (R)-1-(tert-butoxycarbonyl)pyrrolidine-2-carboxylic acid for 1-(tert-butoxycarbonyl)pyrrolidine-3-carboxylic acid, the title compound (67 mg, 50%) was obtained as a yellow solid and as a mixture of rotamers: ¹H NMR (500 MHz, CD₃OD) δ 7.82-7.79 (m, 1H), 7.66-7.56 (m, 1H), 7.49-7.36 (m, 6H), 7.07-7.03 (m, 1H), 6.59-6.56 (m, 1H), 6.36 (dd, J=5.0, 2.5 Hz, 1H), 5.28 (s, 2H), 4.82-4.81 (m, 2H), 4.14-4.05 (m, 1H), 3.97-3.95 (m, 1H), 3.71-3.69 (2×s, 3H), 3.58-3.34 (m, 3H), 3.07-2.94 (m, 2H), 2.70-2.57 (m, 1H), 2.17-1.85 (m, 3H); ESI MS m/z 483 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=13.3 min.

Example 21 Preparation of (S)-4-(Benzyloxy)-1-(5-methyl-2-(pyrrolidine-2-carbonyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

Following the procedure of Example 20, but substituting (S)-1-(tert-butoxycarbonyl)pyrrolidine-2-carboxylic acid for (R)-1-(tert-butoxycarbonyl)pyrrolidine-2-carboxylic acid, the title compound (47 mg, 72%) was obtained as a yellow solid and as a mixture of rotamers: ¹H NMR (500 MHz, CD₃OD) δ 7.82-7.79 (m, 1H), 7.66-7.56 (m, 1H), 7.49-7.36 (m, 6H), 7.07-7.03 (m, 1H), 6.59-6.56 (m, 1H), 6.36 (dd, J=5.0, 2.5 Hz, 1H), 5.28 (s, 2H), 4.82-4.81 (m, 2H), 4.14-4.05 (m, 1H), 3.97-3.95 (m, 1H), 3.71-3.69 (2×s, 3H), 3.58-3.34 (m, 3H), 3.07-2.94 (m, 2H), 2.70-2.57 (m, 1H), 2.17-1.85 (m, 3H); ESI MS m/z 483 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=13.3 min.

Example 22 Preparation of 4-(Benzyloxy)-1-(5-methyl-2-(1-methylpyrrolidine-3-carbonyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

To a solution of 4-(benzyloxy)-1-(5-methyl-2-(pyrrolidine-3-carbonyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride (105 mg, 0.197 mmol) in CH₃OH (3 mL) was added Et₃N (40 μL, 0.29 mmol), formaldehyde (23 μL, 0.29 mmol), and NaBH(OAc)₃ (86 mg, 0.41 mmol). The reaction mixture was stirred at room temperature until the reaction was complete. Then the mixture was concentrated and the residue was dissolved in CH₂Cl₂. The organic layer was washed with H₂O and 5% LiCl, dried with Na₂SO₄, filtered and concentrated. Purification by flash column chromatography (silica gel, 10% CH₃OH in CH₂Cl₂) gave 4-(benzyloxy)-1-(5-methyl-2-(1-methylpyrrolidine-3-carbonyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (60 mg, 60%) as a yellow solid. The free base was converted to the HCl salt to give the title compound (43 mg, 80%) as a yellow solid and as a mixture of rotamers: mp 132-136° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.61-7.33 (m, 8H), 7.02-6.98 (m, 1H), 6.29-6.27 (m, 1H), 6.12-6.11 (m, 1H), 5.17 (s, 2H), 4.79-4.76 (m, 2H), 4.09-3.97 (m, 2H), 3.81-3.79 (m, 1H), 3.69-3.67 (m, 4H), 3.49-3.42 (m, 1H), 3.22-3.16 (m, 2H), 3.00 (m, 1H), 2.92-2.91 (m, 1H), 2.81-2.78 (2×s, 3H), 2.52-2.36 (m, 1H), 2.18-2.00 (m, 1H); ESI MS m/z 497 [M+H]⁺; HPLC (Method B) 98.7% (AUC), t_(R)=13.6 min.

Example 23 Preparation of (R)-4-(Benzyloxy)-1-(5-methyl-2-(1-methylpyrrolidine-2-carbonyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

Following the procedure of Example 22, but substituting (R)-4-(benzyloxy)-1-(5-methyl-2-(pyrrolidine-2-carbonyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride for 4-(benzyloxy)-1-(5-methyl-2-(pyrrolidine-3-carbonyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride, the title compound (80 mg, 67%) was obtained as a yellow solid and as a mixture of rotamers: mp 158-162° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.61-7.33 (m, 8H), 7.03-6.99 (m, 1H), 6.30 (dd, J=7.5, 2.5 Hz, 1H), 6.13 (d, J=2.5 Hz, 1H), 5.18 (s, 2H), 4.80-4.70 (m, 2H), 4.12-4.09 (m, 1H), 3.92-3.90 (m, 1H), 3.78-3.72 (m, 1H), 3.69-3.68 (2s, 3H), 3.49-3.42 (m, 1H), 3.28-3.20 (m, 1H), 3.07-3.00 (m, 2H), 2.96-2.94 (2s, 3H), 2.79-2.65 (m, 1H), 2.21-2.09 (m, 1H), 2.09-1.86 (m, 2H); ESI MS m/z 497 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=13.4 min.

Example 24 Preparation of (S)-4-(Benzyloxy)-1-(5-methyl-2-(1-methylpyrrolidine-2-carbonyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

Following the procedure of Example 22, but substituting (S)-4-(benzyloxy)-1-(5-methyl-2-(pyrrolidine-2-carbonyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride for 4-(benzyloxy)-1-(5-methyl-2-(pyrrolidine-3-carbonyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride, the title compound (40 mg, 61%) was obtained as a yellow solid and as a mixture of rotamers: mp 154-160° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.61-7.33 (m, 8H), 7.03-6.99 (m, 1H), 6.30 (dd, J=7.5, 2.5 Hz, 1H), 6.13 (d, J=2.5 Hz, 1H), 5.18 (s, 2H), 4.80-4.70 (m, 2H), 4.12-4.09 (m, 1H), 3.92-3.90 (m, 1H), 3.78-3.72 (m, 1H), 3.69-3.68 (2s, 3H), 3.49-3.42 (m, 1H), 3.28-3.20 (m, 1H), 3.07-3.00 (m, 2H), 2.96-2.94 (2×s, 3H), 2.79-2.65 (m, 1H), 2.21-2.09 (m, 1H), 2.09-1.86 (m, 2H); ESI MS m/z 497 [M+H]⁺; HPLC (Method B) 98.9% (AUC), t_(R)=13.3 min.

Example 25 Preparation of 1-(2,5-Dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(4-fluorophenyl)pyridine-2(1H)-one hydrochloride a) tert-Butyl 5-methyl-7-(2-oxo-4-(trifluoromethylsulfonyloxy)pyridine-1 (2H)-yl)3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

To a solution of tert-butyl 7-(4-(benzyloxy)-2-oxopyridin-1 (2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (0.98 g, 2.0 mmol) in CH₃OH (30 mL) was added 5% Pd/C (0.3 g) and ammonium formate (0.32 g, 5 mmol) under Ar atmosphere. The reaction mixture was heated to 90° C. and stirred at 90° C. until the reaction was complete. After it was cooled, the reaction mixture was filtered through a layer of Celite. The solvent was concentrated to give tert-butyl 7-(4-hydroxy-2-oxopyridin-1 (2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate, which was used directly without purification.

To a solution of tert-butyl 7-(4-hydroxy-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (800 mg, 2.02 mmol) in THF (10 mL) was added LiN(SiMe₃)₂(2.6 mL, 2.6 mmol) followed by PhN(Tf)₂ (0.94 g, 2.6 mmol) under Ar atmosphere. The reaction mixture was stirred at room temperature until the reaction was complete. Then the mixture was concentrated and the residue was purified by flash column chromatography (silica gel, hexanes/EtOAc, 1:1) to give the title compound (0.42 g, 40%) as a white solid: ¹H NMR (300 MHz, CDCl₃) δ 7.57-7.53 (m, 2H), 7.30 (d, J=1.5 Hz, 1H), 7.02-6.99 (m, 1H), 6.60 (d, J=2.7 Hz, 1H), 6.27 (dd, J=7.8, 2.7 Hz, 1H), 4.65 (s, 2H), 3.85 (m, 2H), 3.65 (s, 3H), 2.84 (m, 2H), 1.51 (s, 9H); ESI MS m/z 528 [M+H]⁺.

b) 1-(2,5-Dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(4-fluorophenyl)pyridine-2(1H)-one hydrochloride

To a solution of tert-butyl 5-methyl-7-(2-oxo-4-(trifluloromethylsulfonyloxy) pyridine-1-(2H)-yl)3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (100 mg, 0.19 mmol) in DMSO (2 mL) was added 4-fluorophenylboronic acid (66 mg, 0.48 mmol), K₂CO₃ (66 mg, 0.48 mmol), and PdCl₂(dppf) (14 mg, 0.019 mmol). The reaction mixture was degassed, then back-filled with N₂. The reaction mixture was stirred at 80° C. in a pre-heated oil bath for 2 hours. After cooling, the reaction was quenched with water and extracted with CH₂Cl₂. The organic layer was washed with H₂O and 5% LiCl, dried with Na₂SO₄, filtered and concentrated. Purification by flash column chromatography (silica gel, 5% CH₃OH in CH₂Cl₂) gave a yellow solid (120 mg, >100%). The solid was dissolved in CH₃OH (2 mL) and treated with 1N HCl in Et₂O (1.9 mL). The reaction mixture was stirred at room temperature until the reaction was complete. After the solvent was removed, the resulting solid was dissolved in CH₃OH (3 mL). Et₃N (40 μL), formaldehyde (22 μL, 0.29 mmol), and NaBH(OAc)₃ were added sequentially. The reaction mixture was stirred at room temperature until the reaction was was complete. The solvent was removed and the residue was dissolved in CH₂Cl₂. The organic layer was washed with H₂O and 5% LiCl, dried with Na₂SO₄, filtered and concentrated. Purification by flash column chromatography (silica gel, 5% CH₃OH in CH₂Cl₂) gave 1-(2,5-dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(4-fluorophenyl)pyridine-2(1H)-one (37 mg 50% yield over three steps) as a yellow solid. The free base was converted to the HCl salt to give the title compound (36.5 mg, 91%) as a yellow solid: mp 276-280° C. (decompose); ¹H NMR (500 MHz, CD₃OD) δ 7.82-7.79 (m, 2H), 7.75 (d, J=7.0 Hz, 1H), 7.61 (d, J=8.5 Hz, 1H), 7.56 (d, J=1.5 Hz, 1H), 7.29-7.25 (m, 2H), 7.14 (dd, J=8.5, 1.5 Hz, 1H), 6.88 (d, J=2.0 Hz, 1H), 6.82 (dd, J=7.0, 2.0 Hz, 1H), 4.77 (d, J=14.0 Hz, 1H), 4.41 (d, J=14.0 Hz, 1H), 3.93-3.90 (m, 1H), 3.76 (s, 3H), 3.66-3.60 (m, 1H), 3.27 (m, 2H), 3.15 (s, 3H); ESI MS m/z 388 [M+H]⁺; HPLC (Method B) 98.1% (AUC), t_(R)=12.8 min.

Example 26 Preparation of 1-(2,5-Dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(4-(trifluoromethylphenyl)pyridin-2(1H)-one hydrochloride

Following the procedure of Example 25 (step b), but substituting 4-trifluoromethylphenylboronic acid for 4-fluorophenylboronic acid, the title compound (47 mg, 53%) was obtained as a yellow solid: mp 270-274° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.95 (d, J=8.5 Hz, 2H), 7.84 (d, J=8.5 Hz, 2H), 7.80 (d, J=7.5 Hz, 1H), 7.62 (d, J=8.0 Hz, 1H), 7.57 (d, J=1.5 Hz, 1H), 7.15 (dd, J=8.5, 2.0 Hz, 1H), 6.96 (d, J=1.5 Hz, 1H), 6.87 (dd, J=7.5, 2.0 Hz, 1H), 4.78 (d, J=14.0 Hz, 1H), 4.41 (d, J=14.0 Hz, 1H), 3.93-3.90 (m, 1H), 3.77 (s, 3H), 3.66-3.60 (m, 1H), 3.27 (m, 2H), 3.15 (s, 3H); ESI MS m/z 438 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=13.8 min.

Example 27 Preparation of 4-(4-Chlorophenyl)-1-(2,5-dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-pyridin-2(1H)-one hydrochloride

Following the procedure of Example 25 (step b), but substituting 4-chlorophenylboronic acid for 4-fluorophenylboronic acid, the title compound (55 mg, 65%) was obtained as a yellow solid: mp 276-280° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.77-7.75 (m, 3H), 7.62 (d, J=8.5 Hz, 1H), 7.57 (d, J=2.0 Hz, 1H), 7.56-7.54 (m, 2H), 7.15 (dd, J=8.5, 2.0 Hz, 1H), 6.91 (d, J=2.0 Hz, 1H), 6.84 (dd, J=7.0, 2.0 Hz, 1H), 4.78 (d, J=14.0 Hz, 1H), 4.41 (d, J=14.0 Hz, 1H), 3.93-3.90 (m, 1H), 3.77 (s, 3H), 3.66-3.60 (m, 1H), 3.27 (m, 2H), 3.15 (s, 3H); ESI MS m/z 404 [M+H]⁺; HPLC (Method B) 98% (AUC), t_(R)=13.4 min.

Example 28 Preparation of 4-(4-Chloro-2-fluorophenyl)-1-(2,5-dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-pyridin-2(1H)-one hydrochloride

Following the procedure of Example 25 (step b), but substituting 4-chloro-2-fluorophenylboronic acid for 4-fluorophenylboronic acid, the title compound (20 mg, 32%) was obtained as a yellow solid: mp 270-274° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.76 (d, J=7.0 Hz, 1H), 7.66-7.57 (m, 2H), 7.57 (d, J=2.0 Hz, 1H), 7.42-7.39 (m, 2H), 7.15 (dd, J=8.5, 2.0 Hz, 1H), 6.84 (s, 1H), 6.73-6.71 (m, 1H), 4.77 (d, J=14.0 Hz, 1H), 4.41 (d, J=14.0 Hz, 1H), 3.93-3.90 (m, 1H), 3.76 (s, 3H), 3.64-3.61 (m, 1H), 3.27 (m, 2H), 3.15 (s, 3H); ESI MS m/z 422 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=12.9 min.

Example 29 Preparation of 1-(2,5-Dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(2-fluoro-4-methoxyphenyl)pyridin-2(1H)-one hydrochloride

Following the procedure of Example 25 (step b), but substituting 2-fluoro-4-methoxyphenylboronic acid for 4-fluorophenylboronic acid, the title compound (46 mg, 53%) was obtained as a yellow solid: mp 280-282° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.72 (d, J=7.0 Hz, 1H), 7.63-7.56 (m, 3H), 7.15 (dd, J=8.5, 1.5 Hz, 1H), 6.92 (dd, J=8.5, 2.5 Hz, 1H), 6.87 (dd, J=13.0, 2.0 Hz, 1H), 6.83 (s, 1H), 6.76 (d, J=7.0 Hz, 1H), 4.77 (d, J=14.0 Hz, 1H), 4.41 (d, J=14.0 Hz, 1H), 3.94-3.90 (m, 1H), 3.88 (s, 3H), 3.76 (s, 3H), 3.66-3.60 (m, 1H), 3.27 (m, 2H), 3.15 (s, 3H); ESI MS m/z 418 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=12.9 min.

Example 30 Preparation of 4-(Benzyloxy)-1-(2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) 2-(6-Bromo-1H-indol-3-yl)ethanamine

Beilstein Registry Number 6056308

3-Bromophenylhydrazine hydrochloride (20.0 g, 85.8 mmol) was reacted according to the procedure of Mascal et al. (Rinehart, Kenneth L.; Kobayashi, Jun'ichi; Harbour, Gary C.; Gilmore, Jeremy; Mascal, Mark; et al. J. Am. Chem. Soc. 1987, 109, 3378-3387) to provide the title compound as a 1:1 mixture of the 6-bromo and 7-bromo-regioisomers (13.2 g, 65%), obtained as an orange solid: ESI MS m/z 239 [M+H]⁺.

b) 7-Bromo-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole

Beilstein Registry Number 5935540

2-(6-Bromo-1H-indol-3-yl)ethanamine (13.2 g, 55.2 mmol) was reacted according to the procedure of Mascal et al. (Rinehart, Kenneth L.; Kobayashi, Jun'ichi; Harbour, Gary C.; Gilmore, Jeremy; Mascal, Mark; et al. J. Am. Chem. Soc. 1987, 109, 3378-3387) to provide the title compound as a 1:1 mixture of the 7-bromo and 8-bromo-regioisomers (8.8 g, 63%), obtained as an orange solid: ESI MS m/z 251 [M+H]⁺.

c) tert-Butyl 7-bromo-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

7-Bromo-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (8.81 g, 35.1 mmol, present as a mixture with the 8-bromo regioisomer) was suspended in CH₂Cl₂ (100 mL) and THF (10 mL). Boc anhydride (7.83 g, 38.6 mmol) and a catalytic amount of 4-(dimethylamino)pyridine (DMAP) were added. After 24 h, the mixture was concentrated. Purification by flash column chromatography (silica gel, hexanes/ethyl acetate, 97:3 to 70:30) separated the 7- and 8-regioisomers and gave the title compound (3.37 g, 27%) as a white powder: ¹H NMR (500 MHz, CDCl₃) δ 7.94 (br s, 1H), 7.45 (d, J=1.6 Hz, 1H), 7.32 (d, J=8.3 Hz, 1H), 7.19 (dd, J=8.3, 1.3 Hz, 1H), 4.61 (br s, 2H), 3.75 (br s, 2H), 2.76 (br s, 2H), 1.50 (s, 9H).

d) tert-Butyl 7-bromo-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

tert-Butyl 7-bromo-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (1.96 g, 5.58 mmol) was dissolved in DMF (20 mL), and sodium hydride (60% weight dispersion in mineral oil, 330 mg, 8.37 mmol) was added. After 30 minutes, methyl iodide (0.52 mL, 8.4 mmol) was added, and the reaction stirred for a further 2 h. The mixture was diluted with methylene chloride and washed with 5% lithium chloride solution (5×), dried and concentrated. Purification by flash column chromatography (silica gel, hexanes/ethyl acetate, 97:3 to 75:25) gave the title compound (1.75 g, 86%) as a white powder: ¹H NMR (500 MHz, CD₃OD) δ 7.41 (d, J=1.5 Hz, 1H), 7.32 (d, J=8.3 Hz, 1H), 7.18 (dd, J=8.4, 1.6 Hz, 1H), 4.60 (br s, 2H), 3.73 (br s, 2H), 3.59 (s, 3H), 2.76 (br s, 2H), 1.50 (s, 9H).

e) 7-Bromo-9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole

tert-Butyl-7-bromo-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (1.75 g, 4.79 mmol) was dissolved in CH₂Cl₂ (10 mL) and trifluoroacetic acid (TFA) (10 mL) was added. After stirring for 1 h, the mixture was diluted with methylene chloride (50 mL), washed with saturated Na₂CO₃ solution, dried over sodium sulfate and concentrated to provide the title compound (1.24 g, 97%) as a yellow oil: ¹H NMR (300 MHz, CDCl₃) δ 7.41 (d, J=1.4 Hz, 1H), 7.32 (d, J=8.3 Hz, 1H), 7.17 (dd, J=8.3, 1.4 Hz, 1H), 4.01 (s, 2H), 3.55 (s, 3H), 3.15 (t, J=6.0 Hz, 2H), 2.72 (t, J=5.7 Hz, 2H).

f) 7-Bromo-2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole

7-Bromo-9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (1.24 g, 4.68 mmol) was dissolved in a mixture of MeOH (20 mL) and CH₂Cl₂ (5 mL) and formaldehyde (0.56 mL, 37% aqueous solution) was added. After stirring for 1 h, NaBH(OAc)₃ (1.98 g, 9.34 mmol) was added and the mixture stirred for a further 10 minutes. The mixture was diluted with methylene chloride (50 mL), washed with saturated Na₂CO₃ solution, concentrated and purified by flash column chromatography (40 g ISCO column eluting with methylene chloride and a methanol/ammonia mixture (10:1); gradient 100% methylene chloride to 90% methylene chloride over 30 min at 40 mL/min) to provide the title compound (1.15 g, 88%) as a white powder: ¹H NMR (500 MHz, CDCl₃) δ 7.40 (d, J=1.6 Hz, 1H), 7.32 (d, J=8.4 Hz, 1H), 7.16 (dd, J=8.3, 1.7 Hz, 1H), 3.61 (s, 2H), 3.55 (s, 3H), 2.86-2.76 (m, 4H), 2.56 (s, 3H).

g) 4-(Benzyloxy)-1-(2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

A stirred solution of 7-bromo-2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (250 mg, 0.895 mmol) in DMSO (4 mL) under nitrogen was treated sequentially with 4-(benzyloxy)pyridin-2(1H)-one (180 mg, 0.895 mmol), 8-hydroxyquinoline (20 mg, 0.14 mmol), CuI (196 mg, 1.04 mmol) and K₂CO₃ (142 mg, 1.04 mmol). The mixture was placed under vacuum for 30 minutes and then flushed with nitrogen. After stirring overnight at 130° C., the mixture was allowed to cool to room temperature, diluted with CH₂Cl₂, washed with brine, dried over Na₂SO₄ and concentrated. Purification by flash column chromatography (12 g ISCO column eluting with methylene chloride and a methanol/ammonia mixture (10:1); gradient 100% methylene chloride to 80% methylene chloride over 30 min at 25 mL/min) provided the free-base. This was dissolved in methylene chloride (2 mL) and treated with 2N HCl in Et₂O (1 equivalent) and the mixture was concentrated to provide the title compound (131 mg, 33%) as a yellow solid: mp 270-274° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.67-7.63 (m, 2H), 7.50-7.40 (m, 3H), 7.43-7.35 (m, 3H), 7.08 (dd, J=8.3, 1.6 Hz, 1H), 6.40 (dd, J=7.5, 2.6 Hz, 1H), 6.21 (d, J=2.6 Hz, 1H), 5.22 (s, 2H), 4.81-4.80 (m, 1H), 4.58 (d, J=15.3 Hz, 1H), 3.88-3.84 (m, 1H), 3.72 (s, 3H), 3.55-3.49 (m, 1H), 3.21-3.16 (m, 5H); ESI MS m/z 400 [M+H]⁺; HPLC (Method B) >98.9% (AUC), t_(R)=13.0 min.

Example 31 Preparation of 1-(2,9-Dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-phenethylpyridin-2(1H)-one hydrochloride a) (E)-2-Methoxy-4-styrylpyridine

4-Bromo-2-methoxypyridine (1.85 g, 9.84 mmol), (E)-phenylvinylboronic acid (4.3 g, 30 mmol), K₂CO₃ (4.0 g, 30 mmol) and PdCl₂(dppf) (400 mg, 0.5 mmol) were stirred in DMSO (15 mL) under vacuum for 30 min. The flask was flushed with nitrogen and the mixture was heated to 90° C. for 30 min. Upon cooling, the mixture was diluted with methylene chloride and washed with 5% lithium chloride solution (5×), dried, concentrated, and the residue was purified by flash column chromatography (silica gel, hexanes/ethyl acetate, 97:3 to 75:25) to provide the title compound (1.93 g, 93%) as an orange oil: ¹H NMR (300 MHz, CDCl₃) δ 8.12 (d, J=5.2 Hz, 1H), 7.51 (m, 2H), 7.40-7.22 (m, 4H), 7.02-6.94 (m, 2H), 6.78 (s, 1H), 3.95 (s, 3H).

b) 2-Methoxy-4-phenethylpyridine

(E)-2-Methoxy-4-styrylpyridine (22.15 g, 104.8 mmol) was dissolved in MeOH (400 mL) and degassed with a nitrogen stream for 10 minutes. Palladium on charcoal (10%, wet, 5 g) was added and the reaction mixture was stirred under an atmosphere of hydrogen for 24 h. The reaction mixture was degassed again, and the catalyst was removed by filtration. Concentration of the filtrate provided the title compound (22 g, 98%) as a green oil: ¹H NMR (500 MHz, CDCl₃) δ 8.04 (d, J=5.3 Hz, 1H), 7.29-7.24 (m, 2H), 7.21-7.15 (m, 3H), 6.69-6.67 (m, 1H), 6.54 (s, 1H), 3.91 (s, 3H), 2.91-2.89 (m, 2H), 2.87-2.84 (m, 2H).

c) 4-Phenethylpyridin-2(1H)-one

2-Methoxy-4-phenethylpyridine (22.0 g, 102 mmol) was stirred in concentrated hydrochloric acid (200 mL) at 120° C. for 18 h and then concentrated. The residue was dissolved in MeOH (100 mL) and made basic with aqueous 6N NaOH and re-concentrated until most of the solvent had been removed. The solids were filtered off, washed with water and dried under vacuum to provide the title compound (21.3 g, 95%) as a beige solid: ¹H NMR (500 MHz, DMSO-d₆) δ 11.31 (br s, 1H), 7.28-7.21 (m, 5H), 7.17 (t, J=7.1 Hz, 1H), 6.10-6.08 (m, 2H), 2.85-2.82 (m, 2H), 2.70-2.67 (m, 2H).

d) 1-(2,9-Dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-phenethylpyridin-2(1H)-one hydrochloride

4-Phenethylpyridin-2(1H)-one (82 mg, 0.41 mmol) and 7-bromo-2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (115 mg, 0.412 mmol) were reacted following the procedure for Example 30 (step g) to provide the title compound (54 mg, 30%) as a yellow solid: mp 299-304° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.67-7.64 (m, 2H), 7.51 (d, J=1.8 Hz, 1H), 7.30-7.24 (m, 4H), 7.20-7.17 (m, 1H), 7.08 (dd, J=8.4, 1.9 Hz, 1H), 6.56 (dd, J=6.9, 1.9 Hz, 1H), 6.53 (s, 1H), 4.85 (m, 1H), 4.49 (d, J=15.3 Hz, 1H), 3.89-3.84 (m, 1H), 3.72 (s, 3H), 3.55-3.50 (m, 1H), 3.21-3.19 (m, 2H), 3.16 (s, 3H), 3.02-2.99 (m, 2H), 2.96-2.93 (m, 2H); ESI MS m/z 398 [M+H]⁺; HPLC (Method B) 98.1% (AUC), t_(R)=13.5 min.

Example 32 Preparation of 1-(2,9-Dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(4-(trifluoromethyl)benzyloxy)pyridin-2(1H)-one hydrochloride a) 4-(4-(Trifluoromethyl)benzyloxy)pyridine 1-oxide

4-Trifluoromethylbenzylalcohol (4.2 g, 23 mmol) was dissolved in DMF (20 mL) and NaH (60% weight dispersion in mineral oil, 0.92 g, 23 mmol) was added. After stirring for 30 minutes, 4-chloropyridine-N-oxide (1.5 g, 11.5 mmol) was added and the reaction mixture was heated for 1 h at 120° C. Upon cooling the mixture was diluted with methylene chloride and washed with 5% lithium chloride solution (5×), dried and concentrated. Purification by flash column chromatography (40 g ISCO column eluting with methylene chloride and a methanol/ammonia mixture (10:1); gradient 100% methylene chloride to 90% methylene chloride over 30 min at 40 mL/min) provided the title compound (0.6 g, 19%) as a yellow solid: ¹H NMR (300 MHz, CDCl₃) δ 8.14 (d, J=7.8 Hz, 2H), 7.68 (d, J=8.1 Hz, 2H), 7.52 (d, J=8.1 Hz, 2H), 6.86 (d, J=7.8 Hz, 2H), 5.15 (s, 2H).

b) 4-(4-(Trifluoromethyl)benzyloxy)pyridin-2(1H)-one

4-(4-(Trifluoromethyl)benzyloxy)pyridine 1-oxide (600 mg, 2.22 mmol) was heated to 140° C. in acetic anhydride (20 mL) for 2 h. The mixture was concentrated and then heated at 80° C. for 1 h in a mixture of MeOH (10 mL) and aqueous 1N NaOH (10 mL). The resultant black solution was concentrated to a volume of 10 mL and extracted with CHCl₃/EtOH (3:1). The organic layer was removed and concentrated to provide the title compound (550 mg, 91%) as a tan solid: ¹H NMR (300 MHz, CD₃OD) δ 7.70-7.60 (m, 4H), 7.41 (d, J=7.0 Hz, 1H), 6.17 (dd, J=7.0, 2.5 Hz, 1H), 5.96 (d, J=2.4 Hz, 1H), 5.18 (s, 2H).

c) 1-(2,9-Dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(4-(trifluoromethyl)benzyloxy)pyridin-2(1H)-one hydrochloride

4-(4-(Trifluoromethyl)benzyloxy)pyridin-2(1H)-one (100 mg, 0.37 mmol) and 7-bromo-2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (103 mg, 0.47 mmol) were reacted following the procedure for Example 30 (step g) to provide the title compound (67 mg, 36%) as a light-brown solid: mp 280-285° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.78-7.73 (m, 3H), 7.69-7.64 (m, 3H), 7.52 (d, J=1.8 Hz, 1H), 7.18-7.08 (m, 1H), 6.55-6.52 (m, 1H), 6.28 (d, J=2.6 Hz, 1H), 5.35 (s, 2H), 4.82-4.80 (m, 1H), 4.50 (d, J=15.4 Hz, 1H), 3.89-3.85 (m, 1H), 3.73 (s, 3H), 3.55-3.50 (m, 1H), 3.22-3.16 (m, 5H); ESI MS m/z 468 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=14.4 min.

Example 33 Preparation of 4-(4-Chlorobenzyloxy)-1-(2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) 4-(4-Chlorobenzyloxy)pyridine 1-oxide

Beilstein Registry Number 7707045

4-Chlorobenzylalcohol (5.0 g, 35 mmol) was dissolved in DMF (25 mL) and NaH (60% weight dispersion in mineral oil, 0.92 g, 23 mmol) was added. After stirring for 30 minutes, 4-chloropyridine-N-oxide (2.27 g, 17.5 mmol) was added and the reaction mixture was heated for 1 h at 120° C. Upon cooling, the mixture was diluted with methylene chloride and washed with 5% lithium chloride solution (5×), dried and concentrated. Purification by flash column chromatography (12 g ISCO column eluting with methylene chloride and a methanol/ammonia mixture (10:1); gradient 100% methylene chloride to 90% methylene chloride over 30 min at 25 mL/min) provided the title compound (1.9 g, 47%) as an orange solid: ¹H NMR (300 MHz, CDCl₃) δ 8.11 (d, J=7.7 Hz, 2H), 7.40 (d, J=8.6 Hz, 2H), 7.34 (d, J=8.6 Hz, 2H), 6.86 (d, J=7.7 Hz, 2H), 5.06 (s, 2H).

b) 4-(4-Chlorobenzyloxy)pyridin-2(1H)-one

Beilstein Registry Number 7707762

4-(4-Chlorobenzyloxy)pyridine 1-oxide (1.95 g, 8.24 mmol) was reacted according to the procedure of Example 32 (step b), and the crude product was purified by flash column chromatography (40 g ISCO column eluting with methylene chloride and a methanol/ammonia mixture (10:1); gradient 100% methylene chloride to 90% methylene chloride over 30 min at 40 mL/min) to provide the title compound (1.0 g, 51%) as a yellow solid: ¹H NMR (500 MHz, CDCl₃) δ 12.70 (br s, 1H), 7.37 (d, J=8.5 Hz, 2H), 7.33 (d, J=8.5 Hz, 2H), 7.22 (d, J=7.3 Hz, 1H), 6.02 (dd, J=7.3, 2.5 Hz, 1H), 5.93 (d, J=2.5 Hz, 1H), 4.98 (s, 2H).

c) 4-(4-Chlorobenzyloxy)-1-(2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

4-(4-Chlorobenzyloxy)pyridin-2(1H)-one (82 mg, 0.34 mmol) and 7-bromo-2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (97 mg, 0.34 mmol) were reacted following the procedure for Example 30 (step g) to provide the title compound (28 mg, 17%) as a yellow solid: mp 290-296° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.83 (d, J=7.6 Hz, 1H), 7.68 (d, J=8.3 Hz, 1H), 7.50-7.46 (m, 3H), 7.44-7.42 (m, 2H), 7.08 (dd, J=8.3, 1.8 Hz, 1H), 6.41 (dd, J=7.6, 2.6 Hz, 1H), 6.21 (d, J=2.6 Hz, 1H), 5.21 (s, 2H), 4.86-4.84 (m, 1H), 4.49 (d, J=15.4 Hz, 1H), 3.88-3.84 (m, 1H), 3.72 (s, 3H), 3.55-3.50 (m, 1H), 3.21-3.16 (m, 5H); ESI MS m/z 434 [M+H]⁺; HPLC (Method B) 98.6% (AUC), t_(R)=14.0 min.

Example 34 Preparation of 1-(2,9-Dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(pyridin-2-ylmethoxy)pyridin-2(1H)-one dihydrochloride a) 4-(Pyridin-2-ylmethoxy)pyridine 1-oxide

2-Pyridylbenzylalcohol (1.67 g, 15.3 mmol) was dissolved in 1,4-dioxane (25 mL) and NaH (60% weight dispersion in mineral oil, 0.92 g, 23 mmol) was added. After stirring for 30 minutes, 4-chloropyridine-N-oxide (2.27 g, 17.5 mmol) was added and the reaction mixture was heated for 1 h at 120° C. Upon cooling, the mixture was purified by flash column chromatography (40 g ISCO column eluting with methylene chloride and a methanol/ammonia mixture (10:1); gradient 100% methylene chloride to 90% methylene chloride over 30 min at 40 mL/min) to provide the title compound (600 mg, 38%) as a brown solid: ¹H NMR (500 MHz, CDCl₃) δ 8.62-8.61 (m, 1H), 8.13-8.10 (m, 2H), 7.74 (overlapping ddd, J=7.8, 1.4 Hz, 1H), 7.44 (d, J=7.8 Hz, 1H), 7.30 (d, J=4.8 Hz, 1H), 6.92-6.89 (m, 2H), 5.23 (s, 2H).

b) 4-(Pyridin-2-ylmethoxy)pyridin-2(1H)-one

4-(Pyridin-2-ylmethoxy)pyridine 1-oxide (9.0 g, 45 mmol) was heated to 140° C. in acetic anhydride (100 mL) for 2 h. The solution was concentrated and then heated at 80° C. for 1 h in a mixture of MeOH (50 mL) and H₂O (50 mL). The resultant black solution was concentrated and the residue was dissolved in hot i-PrOH (40 ml). Et₂O (250 mL) was added and the mixture was placed in the freezer for 16 h. The solid was filtered off to provide the title compound (1.9 g, 21%) as a brown solid: ¹H NMR (300 MHz, DMSO-d₆) δ 11.13 (br s, 1H), 8.58 (d, J=4.7 Hz, 1H), 7.85 (overlapping ddd, J=7.9, 1.6 Hz, 1H), 7.49 (d, J=7.9 Hz, 1H), 7.38-7.34 (m, 1H), 7.26 (d, J=7.3 Hz, 1H), 5.96 (dd, J=7.3, 2.5 Hz, 1H), 5.76 (d, J=3.4 Hz, 1H), 5.12 (s, 2H).

c) 1-(2,9-Dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(pyridin-2-ylmethoxy)pyridin-2(1H)-one dihydrochloride

4-(Pyridin-2-ylmethoxy)pyridin-2(1H)-one (109 mg, 0.539 mmol) and 7-bromo-2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (97 mg, 0.34 mmol) were reacted following the procedure for Example 30 (step g) to provide the title compound (28 mg, 11%) as a yellow solid: mp 160-175° C.; ¹H NMR (500 MHz, CD₃OD) δ 8.90 (dd, J=5.8, 1.8 Hz, 1H), 8.65 (overlapping ddd, J=7.9, 1.6 Hz, 1H), 8.20 (d, J=8.0 Hz, 1H), 8.07 (overlapping dd, J=6.4 Hz, 1H), 7.70 (d, J=7.6 Hz, 1H), 7.65 (d, J=6.4 Hz, 1H), 7.49 (d, J=1.7 Hz, 1H), 7.07 (dd, J=6.8, 1.8 Hz, 1H), 6.63 (dd, J=7.6, 2.7 Hz, 1H), 6.21 (d, J=2.7 Hz, 1H), 5.59 (s, 2H), 4.80 (m, 1H), 4.50 (d, J=15.3 Hz, 1H), 3.88-3.85 (m, 1H), 3.73 (s, 3H), 3.55-3.50 (m, 1H), 3.21-3.16 (m, 5H); ESI MS m/z 401 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=9.3 min.

Example 35 Preparation of 4-((5-Chloropyridin-2-yl)methoxy)-1-(2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride a) 4-((5-Chloropyridin-2-yl)methoxy)pyridine 1-oxide

5-Chloro-2-pyridylbenzylalcohol (4.9 g, 34 mmol) and 4-chloropyridine-N-oxide (2.94 g, 22.7 mmol) were reacted according to Example 34 (step a) to provide the title compound (2.2 g, 40%) as a tan solid: ¹H NMR (300 MHz, CDCl₃) δ 8.58 (d, J=2.2 Hz, 1H), 8.13 (d, J=7.7 Hz, 2H), 7.74 (dd, J=8.4, 2.5 Hz, 1H), 7.43 (d, J=8.4 Hz, 1H), 6.90 (d, J=7.7 Hz, 2H), 5.20 (s, 2H).

5-Chloro-2-pyridylbenzylalcohol (4.9 g, 34 mmol) and 4-chloropyridine-N-oxide (2.94 g, 22.7 mmol) were reacted according to Example 34 (step a) to provide the title compound (2.2 g, 40%) as a tan solid: ¹H NMR (300 MHz, CDCl₃) δ 8.58 (d, J=2.2 Hz, 1H), 8.13 (d, J=7.7 Hz, 2H), 7.76-7.72 (dd, J=8.4, 2.5 Hz, 1H), 7.43 (d, J=8.4 Hz, 1H), 6.90 (d, J=7.7 Hz, 2H), 5.20 (s, 2H).

b) 4-((5-Chloropyridin-2-yl)methoxy)pyridin-2(1H)-one

4-((5-Chloropyridin-2-yl)methoxy)pyridine 1-oxide (2.2 g, 9.2 mmol) was reacted according to Example 34 (step b) to provide the title compound (1.52 g, 69%) as a tan solid: ¹H NMR (500 MHz, CD₃OD) δ 8.56 (d, J=2.3 Hz, 1H), 7.91-7.89 (dd, J=8.4, 2.5 Hz, 1H), 7.56 (d, J=8.4 Hz, 1H), 7.34 (d, J=8.3 Hz, 1H), 6.21-6.19 (dd, J=7.2, 2.5 Hz, 1H), 5.97 (d, J=2.4 Hz, 1H), 5.18 (s, 2H).

c) tert-Butyl 7-(4-((5-chloropyridin-2-yl)methoxy)-2-oxopyridin-1(2H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

4-((5-Chloropyridin-2-yl)methoxy)pyridin-2(1H)-one (259 mg, 1.09 mmol) and tert-butyl 7-bromo-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (400 mg, 1.1 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (145 mg, 25%) as a yellow solid: ESI MS m/z 521 [M+H]⁺.

d) 4-((5-Chloropyridin-2-yl)methoxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride

tert-Butyl 7-(4-((5-chloropyridin-2-yl)methoxy)-2-oxopyridin-1 (2H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (145 mg, 0.278 mmol) was deprotected and converted to the dihydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (114 mg, 94%) as a yellow solid: mp 275-280° C.; ¹H NMR (500 MHz, CD₃OD) δ 8.61 (s, 1H), 7.77 (dd, J=8.3, 3.8 Hz, 1H), 7.64-7.62 (m, 3H), 7.47 (d, J=1.6 Hz, 1H), 7.03 (dd, J=8.4, 1.8 Hz, 1H), 6.37 (dd, J=7.6, 3.8 Hz, 1H), 6.15 (d, J=2.7 Hz, 1H), 5.28 (s, 2H), 4.54 (s, 2H), 3.71 (s, 3H), 3.60 (t, J=6.1 Hz, 2H), 3.12 (t, J=6.0 Hz, 2H); ESI MS m/z 421 [M+H]⁺; HPLC (Method B) 98.5% (AUC), t_(R)=12.1 min

Example 36 Preparation of 4-((5-Chloropyridin-2-yl)methoxy)-1-(2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride

4-((5-Chloropyridin-2-yl)methoxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one (80 mg, 0.19 mmol) was dissolved a mixture of MeOH (3 mL) and CH₂Cl₂ (1 mL) and formaldehyde (9.0 mg, 0.29 mmol, 37% aqueous solution) was added. After stirring for 45 minutes, NaBH(OAc)₃ (80 mg, 0.38 mmol) was added and the reaction mixture was stirred for a further 10 minutes. The mixture was diluted with CH₂Cl₂, washed with saturated Na₂CO₃ solution and concentrated to provide the free base. Conversion to the dihydrochloride salt using the procedure of Example 30 (step g) provided the title compound (83 mg, 86%) as an orange solid: mp 202-210° C.; ¹H NMR (500 MHz, CD₃OD) δ 8.68 (br s, 1H), 8.05 (dd, J=8.0, 2.4 Hz, 1H), 7.76 (d, J=8.4 Hz, 1H), 7.71 (d, J=8.4 Hz, 1H), 7.65 (d, J=8.3 Hz, 1H), 7.51 (d, J=1.6 Hz, 1H), 7.09 (dd, J=8.3, 1.8 Hz, 1H), 6.53 (dd, J=7.6, 1.7 Hz, 1H), 6.28 (d, J=1.6 Hz, 1H), 5.36 (s, 2H), 4.85-4.80 (m, 1H), 4.49 (d, J=15.3 Hz, 1H), 3.89-3.84 (m, 1H), 3.72 (s, 3H), 3.53-3.47 (m, 1H), 3.22-3.19 (m, 2H), 3.16 (s, 3H); ESI MS m/z 435 [M+H]⁺; HPLC (Method B) 97.8% (AUC), t_(R)=12.2 min.

Example 37 Preparation of 4-(4-Chlorophenyl)-1-(2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

4-(4-Chlorophenyl)pyridin-2(1H)-one (80 mg, 0.33 mmol) and 7-bromo-2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (49 mg, 0.33 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (28 mg, 19%) as a yellow-green solid: mp 316-323° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 11.0 (br s, 1H), 7.83 (dd, J=6.8, 1.9 Hz, 2H), 7.76 (d, J=7.1 Hz, 1H), 7.62-7.57 (m, 4H), 7.07 (dd, J=8.3, 1.8 Hz, 1H), 6.81 (d, J=2.0 Hz, 1H), 6.69 (dd, J=7.2, 2.1 Hz, 1H), 4.79 (d, J=15.2 Hz, 1H), 4.44 (dd, J=15.2, 6.0 Hz, 1H), 3.74-3.68 (m, 4H), 3.48-3.38 (m, 1H), 3.10-2.99 (m, 5H); ESI MS m/z 404 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=13.5 min.

Example 38 Preparation of 4-(4-Chlorophenyl)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) tert-Butyl 7-(4-(4-chlorophenyl)-2-oxopyridin-1(2H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

4-(4-Chlorophenyl)pyridin-2(1H)-one (74 mg, 0.32 mmol) and tert-butyl 7-bromo-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (74 mg, 0.36 mmol) were coupled following the procedure of Example 30 (step g) to provide the title compound (85 mg, 54%) as a yellow solid: ¹H NMR (300 MHz, CD₃OD) δ 7.58-7.55 (m, 3H), 7.51-7.44 (m, 3H), 7.35 (s, 1H), 7.07 (dd, J=8.2, 1.6 Hz, 1H), 6.87 (d, J=1.8 Hz, 1H), 6.47 (dd, J=7.1, 1.8 Hz, 1H), 4.65 (br m, 2H), 3.75 (br m, 2H), 3.64 (s, 3H), 2.81 (br m, 2H), 1.52 (s, 9H).

b) 4-(4-Chlorophenyl)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

tert-Butyl 7-(4-(4-chlorophenyl)-2-oxopyridin-1(2H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (85 mg, 0.17 mmol) was deprotected and converted to the hydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (38 mg, 52%) as a yellow solid: mp 310-315° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.78-7.75 (m, 3H), 7.67 (d, J=8.3 Hz, 1H), 7.55-7.53 (m, 3H), 7.13 (dd, J=8.3, 1.8 Hz, 1H), 6.91 (d, J=1.9 Hz, 1H), 6.84 (dd, J=7.1, 2.0 Hz, 1H), 4.56 (s, 2H), 3.74 (s, 3H), 3.61 (t, J=6.0 Hz, 2H), 3.14 (t, J=6.0 Hz, 2H); ESI MS m/z 390 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=13.6 min.

Example 39 Preparation of 1-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(4-(trifluoromethyl)phenyl)pyridin-2(1H)-one hydrochloride hydrochloride a) 4-(4-(Trifluoromethyl)phenyl)pyridine 1-oxide

4-Chloropyridine-N-oxide (3.0 g, 23 mmol), 4-trifluoromethylphenylboronic acid (6.57 g, 34.6 mmol), K₂CO₃ (4.8 g, 35 mmol) and PdCl₂(dppf) (470 mg, 0.57 mmol) were stirred in DMSO (40 mL) under vacuum for 30 min. The flask was flushed with nitrogen and the mixture was heated to 80° C. for 10 min. Upon cooling, the mixture was diluted with methylene chloride and washed with 5% lithium chloride solution (5×), dried, concentrated and the residue was purified by flash column chromatography (40 g ISCO column eluting with methylene chloride and a methanol/ammonia mixture (10:1); gradient 100% methylene chloride to 80% methylene chloride over 30 min at 40 mL/min) to provide the title compound (1.90 g, 34%) as a tan solid: ESI MS m/z 240 [M+H]⁺.

b) 4-(4-(Trifluoromethyl)phenyl)pyridin-2(1H)-one

4-(4-(Trifluoromethyl)phenyl)pyridine-1-oxide (1.9 g, 7.9 mmol) was reacted according to the procedure of Example 32 (step b) to provide the title compound (1.26 g, 66%) as a brown solid: ¹H NMR (300 MHz, CD₃OD) δ 7.80-7.74 (br m, 5H), 6.85-6.66 (br m, 2H).

c) tert-Butyl 9-methyl-7-(2-oxo-4-(4-(trifluoromethyl)phenyl)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

4-(4-(Trifluoromethyl)phenyl)pyridin-2(1H)-one (86 mg, 0.36 mmol) and tert-butyl 7-bromo-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (120 mg, 0.32 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (97 mg, 58%) as a yellow solid: ¹H NMR (300 MHz, CDCl₃) δ 7.74 (s, 4H), 7.58-7.52 (m, 2H), 7.36 (s, 1H), 7.08 (dd, J=8.2, 1.8 Hz, 1H), 6.92 (d, J=1.9 Hz, 1H), 6.50 (dd, J=7.2, 2.0 Hz, 1H), 4.65 (br m, 2H), 3.76 (br m, 2H), 3.65 (s, 3H), 2.81 (br m, 2H), 1.52 (s, 9H).

d) 1-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(4-(trifluoromethyl)phenyl)pyridin-2(1H)-one hydrochloride

tert-Butyl 9-methyl-7-(2-oxo-4-(4-(trifluoromethyl)phenyl)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (97 mg, 0.19 mmol) was deprotected and converted to the hydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (53 mg, 62%) as a yellow solid: mp 316-321° C.; ¹H NMR (300 MHz, CD₃OD) δ 7.97 (d, J=8.1 Hz, 2H), 7.87-7.80 (m, 3H), 7.68 (d, J=8.2 Hz, 1H), 7.57 (d, J=1.5 Hz, 1H), 7.14 (dd, J=8.3, 1.8 Hz, 1H), 6.96 (d, J=1.8 Hz, 1H), 6.87 (dd, J=7.2, 1.8 Hz, 1H), 4.56 (s, 2H), 3.74 (s, 3H), 3.61 (t, J=6.0 Hz, 2H), 3.14 (t, J=6.0 Hz, 2H); ESI MS m/z 424 [M+H]⁺; HPLC (Method B) 96.3% (AUC), t_(R)=14.0 min.

Example 40 Preparation of 1-(2,9-Dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(4-(trifluoromethyl)phenyl)pyridin-2(1H)-one hydrochloride

4-(4-(Trifluoromethyl)phenyl)pyridin-2(1H)-one (100 mg, 0.42 mmol) and 7-bromo-2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (117 mg, 0.419 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (70 mg, 35%) as a yellow-brown solid: mp 294-299° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.96 (d, J=8.2 Hz, 2H), 7.85-7.83 (m, 3H), 7.68 (d, J=8.3 Hz, 1H), 7.58 (d, J=1.6 Hz, 1H), 7.16 (dd, J=8.3, 1.7 Hz, 1H), 6.98 (d, J=1.8 Hz, 1H), 6.90 (dd, J=7.1, 1.9 Hz, 1H), 4.87-4.86 (m, 1H), 4.51 (d, J=15.3 Hz, 1H), 3.90-3.86 (m, 1H), 3.74 (s, 3H), 3.57-3.51 (m, 1H), 3.23-3.20 (m, 2H), 3.17 (s, 3H); ESI MS m/z 438 [M+H]⁺; HPLC (Method B) 95.6% (AUC), t_(R)=14.1 min.

Example 41 Preparation of 4-(2,4-Dichlorophenyl)-1-(2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) 4-(2,4-Dichlorophenyl)pyridine 1-oxide

4-Chloropyridine-N-oxide (1.5 g, 12 mmol), 2,4-dichlorophenylboronic acid (5.4 g, 29 mmol) were reacted according to the procedure of Example 39 (step a) to provide the title compound (1.40 g, 50%) as a grey solid: ¹H NMR (500 MHz, CD₃OD) δ 8.26 (d, J=6.9 Hz, 2H), 7.53 (d, J=2.0 Hz, 1H), 7.37-7.35 (m, 3H), 7.29 (d, J=8.3 Hz, 1H).

b) 4-(2,4-Dichlorophenyl)pyridin-2(1H)-one

4-(2,4-Dichlorophenyl)pyridine 1-oxide (1.4 g, 5.8 mmol) was reacted according to the procedure of Example 32 (step b) to provide the title compound (0.95 g, 67%) as a brown solid: ¹H NMR (300 MHz, DMSO-d₆) δ 11.75 (br m, 1H), 7.75 (s, 1H), 7.51-7.46 (m, 3H), 6.31-6.22 (m, 2H).

c) 4-(2,4-Dichlorophenyl)-1-(2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

4-(2,4-Dichlorophenyl)pyridin-2(1H)-one (103 mg, 0.429 mmol) and 7-bromo-2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (120 mg, 0.43 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (44 mg, 21%) as a yellow solid: mp 308-313° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.77 (d, J=7.0 Hz, 1H), 7.68 (d, J=8.4 Hz, 1H), 7.65 (overlapping dd, J=1.1 Hz, 1H), 7.58 (d, J=1.7 Hz, 1H), 7.49 (s, 2H), 7.16 (dd, J=8.3, 1.8 Hz, 1H), 6.70 (d, J=1.5 Hz, 1H), 6.62 (dd, J=7.0, 1.9 Hz, 1H), 4.86 (m, 1H), 4.50 (d, J=15.3 Hz, 1H), 3.89-3.85 (m, 1H), 3.74 (s, 3H), 3.56-3.55 (m, 1H), 3.23-3.20 (m, 2H), 3.16 (s, 3H); ESI MS m/z 438 [M+H]⁺; HPLC (Method B) 98.5% (AUC), t_(R)=14.3 min.

Example 42 Preparation of 4-(Benzyloxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) tert-Butyl 7-(4-(benzyloxy)-2-oxopyridin-1 (2H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

4-(Benzyloxy)pyridin-2(1H)-one (580 mg, 0.28 mmol) and tert-butyl 7-bromo-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (850 mg, 0.23 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (700 mg, 62%) as a green solid: ¹H NMR (500 MHz, CDCl₃) δ 7.52 (d, J=8.2 Hz, 1H), 7.44-7.39 (m, 4H), 7.38-7.35 (m, 1H), 7.31-7.28 (m, 2H), 7.01 (dd, J=8.3, 1.8 Hz, 1H), 6.09 (d, J=2.6 Hz, 1H), 6.04 (dd, J=7.6, 2.6 Hz, 1H), 5.05 (s, 2H), 4.64 (br m, 2H), 3.74 (br m, 2H), 3.62 (s, 3H), 2.79 (br m, 2H), 1.47 (s, 9H).

b) 4-(Benzyloxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

tert-Butyl 7-(4-(benzyloxy)-2-oxopyridin-1 (2H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (700 mg, 1.44 mmol) was deprotected and converted to the hydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (530 mg, 83%) as a yellow solid: mp 251-257° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 9.71 (br s, 2H), 7.56 (d, J=7.6 Hz, 1H), 7.54 (d, J=8.3 Hz, 1H), 7.50-7.47 (m, 3H), 7.44-7.41 (m, 2H), 7.38-7.37 (m, 1H), 6.99 (dd, J=8.3, 1.8 Hz, 1H), 6.11 (dd, J=7.6, 2.8 Hz, 1H), 5.97 (d, J=2.6 Hz, 1H), 5.15 (s, 2H), 4.45 (s, 2H), 3.81 (s, 3H), 3.42-3.41 (m, 2H), 2.98-2.97 (m, 2H); ESI MS m/z 386 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=12.9 min.

Example 43 Preparation of 4-(Benzyloxy)-1-(2-(2-hydroxyethyl)-9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

4-(Benzyloxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one (70 mg, 0.18 mmol), 2-iodoethanol (156 mg, 0.907 mmol) and K₂CO₃ (250 mg, 1.8 mmol) were combined in DMF (3 mL) and heated to 80° C. for 1 h. Upon cooling, the product was purified by preparative HPLC and then flash column chromatography (12 g ISCO column eluting with methylene chloride and a methanol/ammonia mixture (10:1); gradient 100% methylene chloride to 90% methylene chloride over 30 min at 25 mL/min) to provide the free-base. This was converted to the hydrochloride salt as of Example 30 (step g) to provide the title compound (14.8 mg, 18%) as a yellow solid: ¹H NMR (500 MHz, CD₃OD) δ 7.63 (d, J=8.4 Hz, 1H), 7.61 (d, J=7.5 Hz, 1H), 7.47-7.46 (m, 3H), 7.42-7.39 (m, 2H), 7.36 (d, J=7.1 Hz, 1H), 7.06 (dd, J=8.3, 1.8 Hz, 1H), 6.33 (dd, J=7.6, 2.6 Hz, 1H), 6.15 (d, J=2.6 Hz, 1H), 5.19 (s, 2H), 4.81-4.79 (m, 1H), 4.59 (d, J=15.3 Hz, 1H), 4.01 (t, J=5.1 Hz, 2H), 3.97-3.94 (m, 1H), 3.73 (s, 3H), 3.58-3.50 (m, 3H), 3.21-3.16 (m, 2H); ESI MS m/z 430 [M+H]⁺; HPLC (Method B) 97.2% (AUC), t_(R)=12.8 min.

Example 44 Preparation of 4-(Benzyloxy)-1-(9-methyl-2-(2-(pyrrolidin-1-yl)acetyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) 4-(Benzyloxy)-1-(2-(2-chloroacetyl)-9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one

4-(Benzyloxy)-1-(2-(2-hydroxyethyl)-9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride (100 mg, 0.23 mmol) was stirred in a mixture of CH₂Cl₂ (2 mL) and saturated NaHCO₃ solution (2 mL) and chloroacetyl chloride (32 mg, 0.28 mmol) was added. After 1.5 h, the organic layer was removed and concentrated to provide the title compound (120 mg, 100%) as a yellow oil: ESI MS m/z 462 [M+H]⁺.

b) 4-(Benzyloxy)-1-(9-methyl-2-(2-(pyrrolidin-1-yl)acetyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

4-(Benzyloxy)-1-(2-(2-chloroacetyl)-9-methyl-2, 3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one (120 mg. 0.23 mmol), pyrrolidine (85 mg, 1.2 mmol) and K₂CO₃ (331 mg, 2.39 mmol) were combined in DMF (3 mL) and heated to 80° C. for 1 h. Upon cooling, the mixture was diluted with methylene chloride and washed with 5% lithium chloride solution (5×), dried over Na₂SO₄ and concentrated. The residue was converted to the hydrochloride salt as of Example 30 (step g) to provide the title compound (110 mg, 60%) as a yellow solid: mp 190-200° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.86 (d, J=7.5 Hz, 1H), 7.62 (dd, J=8.2, 2.7 Hz, 1H), 7.51-7.50 (m, 3H), 7.46-7.43 (m, 2H), 7.41-7.40 (m, 1H), 7.08-7.06 (m, 1H), 6.63 (dd, J=7.8, 2.6 Hz, 1H), 6.40 (d, J=1.4 Hz, 1H), 5.31 (s, 2H), 4.93 (s, 1.3H), 4.77 (s, 0.7H), 4.56-4.55 (m, 2H), 4.04-4.02 (m, 0.6H), 3.81-3.78 (m, 3.4H), 3.76 (s, 3H), 3.24-3.19 (m, 2H), 2.79-2.97 (m, 1.3H), 2.92-2.85 (m, 0.7H), 2.22-2.19 (m, 2H), 2.11-2.19 (m, 2H); ESI MS m/z 497 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=13.7 min.

Example 45 Preparation of (S)-4-(Benzyloxy)-1-(9-methyl-2-(pyrrolidine-2-carbonyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) (S)-tert-Butyl 2-(7-(4-(benzyloxy)-2-oxopyridin-1 (2H)-yl)-9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-2-carbonyl)pyrrolidine-1-carboxylate

4-(Benzyloxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride (50 mg, 0.12 mmol) was stirred in DMF (1 mL) and saturated Boc-L-proline (30 mg, 0.14 mmol), HATU (68 mg, 0.18 mmol) and Et₃N (36 mg, 0.36 mmol) were added. After 16 h, the mixture was diluted with methylene chloride and washed with 5% lithium chloride solution (5×), dried over Na₂SO₄ and concentrated. The residue was purified by flash column chromatography (12 g ISCO column eluting with methylene chloride and a methanol/ammonia mixture (10:1); gradient 100% methylene chloride to 90% methylene chloride over 30 min at 25 mL/min) to provide the title compound (55 mg, 78%) as a colorless oil: ESI MS m/z 583 [M+H]⁺.

b) (S)-4-(Benzyloxy)-1-(9-methyl-2-(pyrrolidine-2-carbonyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

(S)-tert-Butyl 2-(7-(4-(benzyloxy)-2-oxopyridin-1 (2H)-yl)-9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-2-carbonyl)pyrrolidine-1-carboxylate (55 mg, 0.094 mmol) was stirred in a mixture of MeOH (2 mL) and 2N HCl in Et₂O (8 mL) for 5 h. The reaction mixture was concentrated to provide the title compound (42 mg, 85%) as a yellow-green solid: mp 220-226° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.79 (dd, J=7.5, 1.4 Hz, 1H), 7.47 (d, J=8.3 Hz, 1H), 7.49-7.46 (m, 3H), 7.44-7.46 (m, 2H), 7.39-7.36 (m, 1H), 7.04 (dd, J=8.3, 1.6 Hz, 1H), 6.57-6.55 (m, 1H), 6.34 (d, J=2.5 Hz, 1H), 5.27 (s, 2H), 4.96-4.87 (m, 2H), 3.90-8.86 (m, 2H), 3.77 (s, 3H), 3.48-3.34 (m, 3H), 3.00-2.86 (m, 2H), 2.67-2.61 (m, 1H), 2.17-2.02 (m, 3H); ESI MS m/z 483 [M+H]⁺; HPLC (Method B) 95.5% (AUC), t_(R)=13.5 min.

Example 46 Preparation of 4-(Benzyloxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-6-yl)pyridin-2(1H)-one hydrochloride a) 2-(5-Bromo-1H-indol-3-yl)ethanamine

Beilstein Registry Number 143491

4-Bromophenylhydrazine hydrochloride (20.0 g, 85.8 mmol) was reacted according to the procedure of Mascal et al. (Rinehart, Kenneth L.; Kobayashi, Jun'ichi; Harbour, Gary C.; Gilmore, Jeremy; Mascal, Mark; et al. J. Am. Chem. Soc. 1987, 109, 3378-3387) to provide the title compound (5.2 g, 25%) as an orange solid: ESI MS m/z 239 [M+H]⁺.

b) 6-Bromo-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole

Beilstein Registry Number 911238

2-(5-Bromo-1H-indol-3-yl)ethanamine (5.2 g, 22 mmol) was reacted according to the procedure of Mascal et al. (Rinehart, Kenneth L.; Kobayashi, Jun'ichi; Harbour, Gary C.; Gilmore, Jeremy; Mascal, Mark; et al. J. Am. Chem. Soc. 1987, 109, 3378-3387) to provide the title compound (2.6 g, 48%) as an orange solid: ESI MS m/z 251 [M+H]⁺.

c) tert-Butyl 6-bromo-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

6-Bromo-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (2.6 g, 10 mmol) was suspended in CH₂Cl₂ (50 mL) and THF (7.5 mL) and Boc₂O (2.3 g, 11 mmol) was added. After 2.5 h, the mixture was concentrated. Purification by flash column chromatography (silica gel, hexanes/ethyl acetate, 97:3 to 70:30) gave the title compound (1.15 g, 30%) as an orange powder: ¹H NMR (300 MHz, CDCl₃) δ 7.59 (s, 1H), 7.23 (d, J=8.5 Hz, 1H), 7.18 (d, J=8.5 Hz, 1H), 4.68-4.59 (br m, 2H), 3.80-3.70 (br m, 2H), 2.78-2.71 (br m, 2H), 1.50 (s, 9H).

d) tert-Butyl 6-bromo-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

tert-Butyl 6-bromo-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (1.15 g, 3.26 mmol) was dissolved in DMF (20 mL) and sodium hydride (60% weight dispersion in mineral oil, 196 mg, 4.89 mmol) was added. After 1 h, methyl iodide (0.30 mL, 4.9 mmol) was added and the reaction mixture was stirred for a further 30 min. The mixture was diluted with methylene chloride and washed with 5% lithium chloride solution (5×), dried over Na₂SO₄ and concentrated. Purification by flash column chromatography (silica gel, hexanes/ethyl acetate, 97:3 to 75:25) gave the title compound (740 mg, 36%) as a yellow solid: ¹H NMR (500 MHz, CDCl₃) δ 7.58 (s, 1H), 7.24 (d overlapped by solvent, J=8.5, 1H), 7.14 (d, J=8.5, 1H), 4.67-4.53 (br m, 2H), 3.79-3.67 (br m, 2H), 3.60 (s, 3H), 2.78-2.66 (br m, 2H), 1.51 (s, 9H).

e) tert-Butyl 6-(4-(benzyloxy)-2-oxopyridin-1 (2H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

A solution of tert-Butyl-6-bromo-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (750 mg, 2.03 mmol) in DMSO (10 mL) was stirred under nitrogen and treated sequentially with 4-(benzyloxy)pyridin-2(1H)-one (448 mg, 2.23 mmol), 8-hydroxyquinoline (44 mg, 0.305 mmol), CuI (58 mg, 0.305 mmol) and K₂CO₃ (308 mg, 2.23 mmol). After stirring overnight at 130° C., the mixture was allowed to cool to room temperature and a mixture of MeOH and NH₄OH (10:1, 10 mL) was added. After stirring for 15 min, the mixture was diluted with CH₂Cl₂, washed with brine, dried over Na₂SO₄, filtered and concentrated to dryness. Purification by flash column chromatography (40 g ISCO column eluting with a 1:1 ethylacetate/hexanes and a methanol/ammonia mixture (10:1); gradient 100% 1:1 ethylacetate/hexanes to 90% 1:1 ethylacetate/hexanes/10% methanol/ammonia mixture (10:1) over 30 min at 25 mL/min) provided the title compound (340 mg, 33%) as a yellow solid; ¹H NMR (500 MHz, CDCl₃) δ 7.50-7.36 (m, 8H), 7.13 (d, J=7.8, Hz, 1H), 6.09 (d, J=2.6 Hz, 1H), 6.03 (dd, J=7.5, 2.7 Hz, 1H), 5.05 (s, 2H), 4.65 (br s, 2H), 3.73 (br s, 2H), 3.66 (s, 3H), 2.77 (br s, 2H), 1.51 (s, 9H).

f) 4-(Benzyloxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-6-yl)pyridin-2(1H)-one hydrochloride

tert-Butyl 6-(4-(benzyloxy)-2-oxopyridin-1 (2H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (0.340 g, 0.70 mmol) was dissolved in MeOH (5 mL) and 2N HCl in ether (15 mL) was added. After stirring for 1 h, the liquid was decanted off and the resultant solid was filtered and washed with ether (3×). This provided the title compound (267 mg, 98%) as a light yellow solid: mp 290-300° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.66 (d, J=7.5 Hz, 1H), 7.57-7.52 (m, 2H), 7.46 (d, J=7.7 Hz, 2H), 7.41 (overlapping dd, J=7.3 Hz, 2H), 7.36 (d, J=7.5 Hz, 1H), 7.19 (dd, J=8.6, 2.0 Hz, 1H), 6.42 (dd, J=7.5, 2.7 Hz, 1H), 6.22 (d, J=2.6 Hz, 1H), 5.22 (s, 2H), 4.55 (s, 2H), 3.75 (s, 3H), 3.58 (t, J=6.0 Hz, 2H), 3.10 (t, J=6.0 Hz, 2H); ESI MS m/z 386 [M+H]⁺; HPLC (Method B) 98.8% (AUC), t_(R)=12.8 min.

Example 47 Preparation of 4-(Benzyloxy)-1-(2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

4-(Benzyloxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pydido[3,4-b]indol-6-yl)pyridine-2(1H)-one hydrochloride (126 mg, 0.325 mmol) was dissolved in MeOH (2 mL) and CH₂Cl₂ (0.5 mL) and formaldehyde (0.036 mL, 37% aqueous solution) was added. After stirring for 1 h, NaBH(OAc)₃ (138 mg, 0.651 mmol) was added and the mixture was stirred for a further 40 min. The mixture was diluted with methylene chloride (50 mL), washed with saturated Na₂CO₃ solution, concentrated and purified by flash column chromatography (12 g ISCO column eluting with methylene chloride and a methanol/ammonia mixture (10:1); gradient 100% methylene chloride to 85% methylene chloride over 30 min at 40 mL/min), and further purified by preparative HPLC to provide the title compound (55.5 mg, 43%) as a white powder: mp 260-270° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.56-7.53 (m, 2H), 7.51 (d, J=1.8, 1H), 7.46 (d, J=7.3 Hz, 2H), 7.41 (overlapping dd, J=7.4 Hz, 2H), 7.36 (d, J=7.2 Hz, 1H), 7.19 (dd, J=8.6, 2.0 Hz, 1H), 6.27 (dd, J=7.6, 2.7 Hz, 1H), 6.11 (d, J=2.6 Hz, 1H), 5.18 (s, 2H), 4.64 (br s, 2H), 3.75 (s, 3H), 3.67 (br s, 2H), 3.18-3.13 (m, 5H); ESI MS m/z 400 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=12.9 min.

Example 48 Preparation of 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one dihydrochloride a) 2′-Methoxy-5-(trifluoromethyl)-2,4′-bipyridine

2-Bromo-5-trifluoromethylpyridine (410 mg, 2.13 mmol) and 2-methoxy-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine (500 mg, 1.81 mmol) were reacted according to Example 31 (step a) to provide the title compound (337 mg, 62%) as a white solid: ¹H NMR (300 MHz, CDCl₃) δ 8.96 (s, 1H), 8.31 (d, J=5.4 Hz, 1H), 8.04 (dd, J=8.3, 2.1 Hz, 1H), 7.87 (d, J=8.3 Hz, 1H), 7.51 (dd, J=5.4, 1.4 Hz, 1H), 7.36 (s, 1H), 3.52 (s, 3H).

b) 4-(5-(Trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one

2′-Methoxy-5-(trifluoromethyl)-2,4′-bipyridine (337 mg, 1.32 mmol) was reacted reacted according to Example 31 (step c) to provide the title compound (289 mg, 89%) as a white solid: ¹H NMR (300 MHz, DMSO-d₆) δ 11.08 (s, 1H) 9.10 (s, 1H), 8.35 (dd, J=8.4, 2.1 Hz, 1H), 8.25 (d, J=8.3 Hz, 1H), 7.53 (d, J=6.8, 1H), 7.09 (d, J=1.3 Hz, 1H), 6.90 (dd, J=6.8, 1.6 Hz, 1H).

c) tert-Butyl 5-methyl-7-(2-oxo-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

4-(5-(Trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one (100 mg, 0.41 mmol) and tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (152 mg, 0.416 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (83 mg, 38%) as a green solid: ¹H NMR (500 MHz, CDCl₃) δ 9.00 (s, 1H), 8.06 (dd, J=8.3, 2.1 Hz, 1H), 7.91 (d, J=8.3 Hz, 1H), 7.58 (d, J=7.2 Hz, 1H), 7.55 (d, J=8.2 Hz, 1H), 7.37 (d, J=1.6 Hz, 1H), 7.25 (d, J=1.6 Hz, 1H), 7.08 (d, J=7.5 Hz, 1H), 7.03 (dd, J=7.1, 1.8 Hz, 1H), 4.66 (s, 2H), 3.85 (br m, 2H), 3.66 (s, 3H), 2.84 (br m, 2H), 1.51 (s, 9H).

d) 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one dihydrochloride

tert-Butyl 5-methyl-7-(2-oxo-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (83 mg, 0.16 mmol) was deprotected and converted to the dihydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (51 mg, 78%) as a yellow solid: mp 320-330° C.; ¹H NMR (500 MHz, CD₃OD) δ 9.06 (s, 1H), 8.28 (dd, J=8.4, 2.1 Hz, 1H), 8.23 (d, J=8.2 Hz, 1H), 7.87 (d, J=7.1 Hz, 1H), 7.64 (d, J=8.3 Hz, 1H), 7.58 (d, J=1.6 Hz, 1H), 7.43 (d, J=1.6 Hz, 1H), 7.29 (dd, J=Hz, 1H), 7.17 (dd, J=8.3, 1.8 Hz, 1H), 4.50 (s, 2H), 3.76 (s, 3H), 3.69 (t, J=6.0 Hz, 2H), 3.22 (t, J=Hz, 2H); ESI MS m/z 425 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=12.5 min.

Example 49 Preparation of 4-((5-Fluoropyridin-2-yl)methoxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride a) 4-((5-Fluoropyridin-2-yl)methoxy)pyridine 1-oxide

5-Fluoro-2-pyridylbenzylalcohol (3.00 g, 23.6 mmol) and 4-chloropyridine-N-oxide (2.03 g, 15.7 mmol) were reacted according to Example 34 (step a) to provide the title compound (1.76 g, 50%) as a tan solid: ¹H NMR (300 MHz, CDCl₃) δ 8.48 (s, 1H), 8.12 (d, J=7.7 Hz, 2H), 7.48-7.46 (m, 2H), 6.90 (d, J=7.7 Hz, 2H), 5.20 (s, 2H).

b) 4-((5-Fluoroyridin-2-yl)methoxy)pyridin-2(1H)-one

4-((5-Fluoropyridin-2-yl)methoxy)pyridine 1-oxide (1.76 g, 7.99 mmol) was reacted according to Example 34 (step b) to provide the title compound (1.29 g, 73%) as a yellow solid: ¹H NMR (500 MHz, DMSO-d₆) δ 11.12 (s, 1H), 8.59 (d, J=2.9 Hz, 1H), 7.79 (dt, J=8.7, 2.9 Hz, 1H), 7.60 (dd, J=8.7, 4.5 Hz, 1H), 7.26 (d, J=7.3 Hz, 1H), 5.95 (dd, J=7.4, 2.6 Hz, 1H), 5.78 (d, J=2.5 Hz, 1H), 5.12 (s, 2H).

c) tert-Butyl 7-(4-((5-fluoropyridin-2-yl)methoxy)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

4-((5-Fluoropyridin-2-yl)methoxy)pyridin-2(1H)-one (275 mg, 1.25 mmol) and tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (456 mg, 1.25 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (420 mg, 66%) as a yellow solid: ¹H NMR (500 MHz, CDCl₃) δ 8.15 (d, J=2.1 Hz, 1H), 7.50 (m, 3H), 7.36 (d, J=7.8 Hz, 1H), 7.31 (d, J=1.6 Hz, 1H), 7.01 (d, J=8.9 Hz, 1H), 6.11-6.08 (m, 2H), 5.18 (s, 2H), 4.65 (s, 2H), 3.87 (t, J=5.3 Hz, 2H), 3.65 (s, 3H), 2.84 (t, J=4.2 Hz, 2H), 1.60 (s, 9H).

d) 4-((5-Fluoropyridin-2-yl)methoxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride

tert-Butyl 7-(4-((5-fluoropyridin-2-yl)methoxy)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (415 mg, 0.823 mmol) was deprotected and converted to the dihydrochloride according to procedure of Example 30 (steps e and g) to provide the title compound (328 mg, 84%) as a white solid: mp 174-180° C.; ¹H NMR (500 MHz, CD₃OD) δ 8.70 (s, 1H), 8.00 (dt, J=8.4, 2.8 Hz, 1H), 7.91-7.88 (m, 2H), 7.63 (d, J=8.4 Hz, 1H), 7.55 (s, 1H), 7.11 (dd, J=8.3, 1.7 Hz, 1H), 6.69 (dd, J=7.5, 2.7 Hz, 1H), 6.45 (d, J=2.6 Hz, 1H), 5.46 (s, 2H), 4.49 (s, 2H), 3.75 (s, 3H), 3.68 (t, J=6.1 Hz, 2H), 3.22 (t, J=6.1 Hz, 2H); ESI MS m/z 405 [M+H]⁺; HPLC (Method B) 95.5% (AUC), t_(R)=10.9 min.

Example 50 Preparation of 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(6-(trifluoromethyl)pyridazin-3-yl)pyridin-2(1H)-one hydrochloride a) 3-(2-Methoxypyridin-4-yl)-6-(trifluoromethyl)pyridazine

3-Chloro-6-(trifluoromethyl)pyridazine (137 mg, 0.751 mmol) and 2-methoxy-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine (176 mg, 0.749 mmol) were reacted according to Example 31 (step a) to provide the title compound (115 mg, 60%) as a white solid: ¹H NMR (500 MHz, CDCl₃) δ 8.39 (d, J=5.8 Hz, 1H), 8.05 (d, J=8.8 Hz, 1H), 7.94 (d, J=8.8 Hz, 1H), 7.62 (dd, J=5.4, 1.5 Hz, 1H), 7.45 (s, 1H), 4.03 (s, 3H).

b) 4-(6-(Trifluoromethyl)pyridazin-3-yl)pyridin-2(1H)-one

3-(2-Methoxypyridin-4-yl)-6-(trifluoromethyl)pyridazine (115 mg, 0.451 mmol) was reacted according to Example 31 (step c) to provide the title compound (120 mg, quant) as a white solid: ¹H NMR (500 MHz, DMSO-d₆) δ 11.87 (s, 1H), 8.61 (d, J=8.9 Hz, 1H), 8.42 (d, J=8.9 Hz, 1H), 7.62 (d, J=6.8 Hz, 1H), 7.19 (s, 1H), 7.01 (dd, J=6.8, 1.6 Hz, 1H).

c) tert-Butyl 5-methyl-7-(2-oxo-4-(6-(trifluoromethyl)pyridazin-3-yl)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

4-(6-(Trifluoromethyl)pyridazin-3-yl)pyridin-2(1H)-one (60 mg, 0.25 mmol) and tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (90 mg, 0.25 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (60 mg, 46%) as a yellow solid: ¹H NMR (500 MHz, CDCl₃) δ 8.10 (d, J=8.8 Hz, 1H), 7.79 (d, J=8.8 Hz, 1H), 7.66 (d, J=7.0 Hz, 1H), 7.56 (d, J=8.2 Hz, 1H), 7.38 (d, J=1.3 Hz, 1H), 7.26-7.24 (m, 2H), 7.10 (d, J=7.8 Hz, 1H), 4.66 (s, 2H), 3.66 (t, J=3.3 Hz, 2H), 3.86 (s, 3H), 2.84 (t, J=3.3 Hz, 2H), 1.51 (s, 9H).

d) 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(6-(trifluoromethyl)pyridazin-3-yl)pyridin-2(1H)-one hydrochloride

tert-Butyl 5-methyl-7-(2-oxo-4-(6-(trifluoromethyl)pyridazin-3-yl)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (60 mg, 0.11 mmol) was deprotected and converted to the hydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (44 mg, 88%) as a yellow solid: mp 315-320° C.; ¹H NMR (500 MHz, CD₃OD) δ 8.54 (d, J=8.8 Hz, 1H), 8.28 (d, J=8.9 Hz, 1H), 7.91 (d, J=7.0 Hz, 1H), 7.64 (d, J=8.4 Hz, 1H), 7.60 (d, J=1.5 Hz, 1H), 7.44 (d, J=1.5 Hz, 1H), 7.35 (dd, J=7.2, 1.9 Hz, 1H), 7.16 (dd, J=8.3, 1.8 Hz, 1H), 4.50 (s, 2H), 3.77 (s, 3H), 3.69 (t, J=6.1 Hz, 2H), 3.22 (t, J=6.0 Hz, 2H); ESI MS m/z 426 [M+H]⁺; HPLC (Method B) 95.9% (AUC), t_(R)=11.7 min.

Example 51 Preparation of 4-((5-Chloropyridin-2-yl)methoxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride a) tert-Butyl 7-(4-((5-chloropyridin-2-yl)methoxy)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

4-((5-Chloropyridin-2-yl)methoxy)pyridin-2(1H)-one (127 mg, 0.537 mmol) and tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (200 mg, 1.1 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (113 mg, 40%) as a white solid: ¹H NMR (300 MHz, CDCl₃) δ 8.59 (d, J=2.4 Hz, 1H), 7.73 (dd, J=8.4, 2.4 Hz, 1H), 7.51 (d, J=8.3 Hz, 1H), 7.45 (d, J=8.3 Hz, 1H), 7.33 (d, J=7.5 Hz, 1H), 7.29 (d, J=1.5 Hz, 1H), 7.01 (d, J=7.9 Hz, 1H), 6.09 (dd, J=7.5, 2.7 Hz, 1H), 6.05 (d, J=2.5 Hz, 1H), 5.17 (s, 2H), 4.64 (s, 2H), 3.84 (t, J=5.4 Hz, 2H), 3.63 (s, 3H), 2.82 (t, J=5.4 Hz, 2H), 1.50 (s, 9H).

b) 4-((5-Chloropyridin-2-yl)methoxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride

tert-Butyl 7-(4-((5-chloropyridin-2-yl)methoxy)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (108 mg, 0.207 mmol) was deprotected and converted to the dihydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (99 mg, 97%) as a white solid: mp 290-320° C. dec; ¹H NMR (300 MHz, CD₃OD) δ 8.61 (d, J=2.1 Hz, 1H), 7.95 (dd, J=8.4, 2.4 Hz, 1H), 7.62 (d, J=7.6 Hz, 2H), 7.58 (d, J=8.4 Hz, 1H), 7.47 (d, J=1.6 Hz, 1H), 7.05 (dd, J=8.3, 1.8 Hz, 1H), 6.36 (dd, J=7.6, 2.2 Hz, 1H), 6.13 (d, J=2.6 Hz, 1H), 5.28 (s, 2H), 4.48 (s, 2H), 3.73 (s, 3H), 3.67 (t, J=6.2 Hz, 2H), 3.02 (t, J=6.2 Hz, 2H); ESI MS m/z 421 [M+H]⁺; HPLC (Method B) 98.2% (AUC), t_(R)=12.0 min.

Example 52 Preparation of 4-((5-Chloropyridin-2-yl)methoxy)-1-(2,5-dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride

4-((5-Chloropyridin-2-yl)methoxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (50 mg, 0.12 mmol) was reacted according to the procedure of Example 47 to provide the free-base. Conversion to the dihydrochloride salt using the procedure of Example 30 (step g) provided the title compound (39 mg, 64%) as a white solid: mp 278-282° C.; 1H NMR (300 MHz, CD₃OD) δ 8.60 (d, J=2.0 Hz, 1H), 7.96-7.92 (m, 1H), 7.61 (d, J=7.7 Hz, 2H), 7.57 (d, J=8.3 Hz, 1H), 7.47 (d, J=1.4 Hz, 1H), 7.06 (dd, J=8.4, 1.7 Hz, 1H), 6.34 (dd, J=7.6, 2.6 Hz, 1H), 6.12 (d, J=2.6 Hz, 1H), 5.27 (s, 2H), 4.75 (d, J=14.2 Hz, 1H), 4.38 (d, J=14.1 Hz, 1H), 3.95-3.85 (m, 1H), 3.73 (s, 3H), 3.63 (m, 1H), 3.31 (m overlapping with solvent, 2H), 3.13 (s, 3H); ESI MS m/z 435 [M+H]⁺; HPLC (Method B) 98.9% (AUC), t_(R)=12.1 min.

Example 53 Preparation of 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(pyridin-2-ylmethoxy)pyridin-2(1H)-one dihydrochloride a) tert-Butyl 5-methyl-7-(2-oxo-4-(pyridin-2-ylmethoxy)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

4-(Pyridin-2-ylmethoxy)pyridin-2(1H)-one (110 mg, 0.54 mmol) and tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (200 mg, 0.54 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (113 mg, 43%) as a yellow oil: ¹H NMR (300 MHz, CDCl₃) δ 8.63 (ddd, J=4.9, 1.6, 0.9 Hz, 1H), 7.75 (overlapping ddd, J=7.6, 1.8 Hz, 1H), 7.49 (t, J=7.3 Hz, 2H), 7.33 (d, J=7.5 Hz, 1H), 7.29 (d, J=1.4 Hz, 1H), 7.26 (m overlapping with solvent, 1H), 7.01 (d, J=7.9 Hz, 1H), 6.12-6.07 (m, 2H), 5.19 (s, 2H), 4.64 (s, 2H), 3.84 (t, J=5.4 Hz, 2H), 3.62 (s, 3H), 2.82 (t, J=5.4 Hz, 2H), 1.52 (s, 9H).

b) 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(pyridin-2-ylmethoxy)pyridin-2(1H)-one dihydrochloride

tert-Butyl 5-methyl-7-(2-oxo-4-(pyridin-2-ylmethoxy)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (113 mg, 0.23 mmol) was deprotected and converted to the dihydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (81 mg, 77%) as a white solid: mp 206-211° C.; ¹H NMR (300 MHz, CDCl₃) δ 8.88 (d, J=5.2 Hz, 1H), 8.59 (dd, J=7.9, 1.5 Hz, 1H), 8.15 (d, J=8.0 Hz, 1H), 8.01 (overlapping dd, J=6.6 Hz, 1H), 7.69 (d, J=7.6 Hz, 1H), 7.60 (d, J=8.4 Hz, 1H), 7.48 (d, J=1.6 Hz, 1H), 7.06 (dd, J=8.4, 1.8 Hz, 1H), 6.44 (dd, J=7.6, 2.7 Hz, 1H), 6.21 (d, J=2.7 Hz, 1H), 5.57 (s, 2H), 4.48 (s, 2H), 3.74 (s, 3H), 3.68 (t, J=6.2 Hz, 2H), 3.21 (t, J=6.2 Hz, 2H); ESI MS m/z 387 [M+H]⁺; HPLC (Method B) 98% (AUC), t_(R)=9.3 min.

Example 54 Preparation of 1-(2,5-Dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(pyridin-2-ylmethoxy)pyridin-2(1H)-one dihydrochloride

1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(pyridin-2-ylmethoxy)pyridin-2(1H)-one (45 mg, 0.116 mmol) was reacted according to the procedure of Example 47 to provide the free-base. Conversion to the dihydrochloride salt using the procedure of Example 30 (step g) provided the title compound (54 mg, 98%) as a white solid: mp 260-265° C.; ¹H NMR (500 MHz, CD₃OD) δ 8.87 (d, J=5.7 Hz, 1H), 8.58 (overlapping dd, J=8.2 Hz, 1H), 8.14 (d, J=7.9 Hz, 1H), 8.00 (overlapping dd, J=6.6 Hz, 1H), 7.69 (d, J=7.6 Hz, 1H), 7.59 (d, J=8.3 Hz, 1H), 7.49 (s, 1H), 7.07 (dd, J=8.3, 1.7 Hz, 1H), 6.44 (dd, J=7.5, 2.6 Hz, 1H), 6.20 (d, J=2.0 Hz, 1H), 5.56 (s, 2H), 4.76 (d, J=14.2 Hz, 1H), 4.40 (d, J=14.2 Hz, 1H), 3.91 (m, 1H), 3.74 (s, 3H), 3.61 (m, 1H), 3.29-3.17 (m overlapping with solvent, 2H), 3.13 (s, 3H); ESI MS m/z 401 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=9.2 min.

Example 55 Preparation of 1-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(pyridin-2-ylmethoxy)pyridin-2(1H)-one dihydrochloride a) tert-Butyl 9-methyl-7-(2-oxo-4-(pyridin-2-ylmethoxy)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

4-(Pyridin-2-ylmethoxy)pyridin-2(1H)-one (138 mg, 0.682 mmol) and tert-butyl 7-bromo-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (250 mg, 0.68 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (170 mg, 51%) as a white foam: ¹H NMR (300 MHz, CDCl₃) δ 8.63 (d, J=4.1 Hz, 1H), 7.76 (overlapping ddd, J=7.7, 1.7 Hz, 1H), 7.53 (d, J=8.3 Hz, 1H), 7.48 (d, J=7.8 Hz, 1H), 7.33 (d, J=7.4 Hz, 1H), 7.29-7.26 (m overlapping with solvent, 2H), 7.01 (dd, J=8.2, 1.8 Hz, 1H), 6.12-6.07 (m, 2H), 5.19 (s, 2H), 4.63 (s, 2H), 3.74 (br s, 2H), 3.62 (s, 3H), 2.79 (s, 2H), 1.51 (s, 9H).

b) 1-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(pyridin-2-ylmethoxy)pyridin-2(1H)-one dihydrochloride

tert-Butyl 9-methyl-7-(2-oxo-4-(pyridin-2-ylmethoxy)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (167 mg, 0.34 mmol) was deprotected and converted to the dihydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (124 mg, 79%) as a yellow solid: mp 226-231° C.; ¹H NMR (500 MHz, CD₃OD) δ 8.89 (d, J=5.4 Hz, 1H), 8.61 (overlapping ddd, J=8.0, 1.6 Hz, 1H), 8.16 (d, J=8.0 Hz, 1H), 8.02 (overlapping dd, J=6.6 Hz, 1H), 7.70 (d, J=7.6 Hz, 1H), 7.63 (d, J=8.4 Hz, 1H), 7.47 (d, J=1.6 Hz, 1H), 7.06 (dd, J=8.4, 1.8 Hz, 1H), 6.44 (dd, J=7.6, 2.7 Hz, 1H), 6.21 (d, J=2.6 Hz, 1H), 5.57 (s, 2H), 4.56 (s, 2H), 3.73 (s, 3H), 3.60 (t, J=6.0, 2H), 3.13 (t, J=6.0, 2H); ESI MS m/z 387 [M+H]⁺; HPLC (Method B) 98.6% (AUC), t_(R)=9.2 min.

Example 56 Preparation of 1-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-phenethylpyridin-2(1H)-one dihydrochloride a) tert-Butyl 9-methyl-7-(2-oxo-4-phenethylpyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

4-Phenethylpyridin-2(1H)-one (817 mg, 4.10 mmol) and tert-butyl 7-bromo-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (1.5 g, 4.1 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (1.2 g, 60%) as a yellow solid: ¹H NMR (300 MHz, CDCl₃) δ 7.53 (d, J=8.1 Hz, 1H), 7.34-7.29 (m, 4H), 7.26-7.20 (m, 3H), 7.03 (dd, J=8.2, 1.5 Hz, 1H), 6.50 (s, 1H), 6.09 (dd, J=6.9, 1.6 Hz, 1H), 4.63 (br s, 2H), 3.74 (br s, 2H), 3.63 (s, 3H), 2.98-2.91 (m, 2H), 2.84-2.79 (m, 4H), 1.51 (s, 9H).

b) 1-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-phenethylpyridin-2(1H)-one dihydrochloride

tert-Butyl 9-methyl-7-(2-oxo-4-phenethylpyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (1.2 g, 2.4 mmol) was deprotected and converted to the dihydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (550 mg, 51%) as a yellow solid: mp 280-295° C.; ¹H NMR (300 MHz, DMSO-d₆) δ 9.67 (s, 2H), 7.59-7.52 (m, 3H), 7.35-7.27 (m, 4H), 7.24-7.17 (m, 1H), 7.01 (dd, J=7.4, 2.0 Hz, 1H), 6.38-6.27 (m, 2H), 4.45 (s, 2H), 3.67 (s, 3H), 3.42 (t, J=6.4 Hz, 2H), 2.97-2.89 (m, 4H), 2.81-2.76 (m, 2H); ESI MS m/z 384 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=13.3 min.

Example 57 Preparation of 4-(5-Chloropyridin-2-yl)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride a) tert-Butyl 7-(4-(5-chloropyridin-2-yl)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

4-(5-Chloropyridin-2-yl)pyridin-2(1H)-one (111 mg, 0.537 mmol) and tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (200 mg, 0.54 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (80 mg, 30%) as a green solid: ¹H NMR (500 MHz, CDCl₃) δ 8.69 (d, J=2.2 Hz, 1H), 7.79 (dd, J=8.5, 2.4 Hz, 1H), 7.74 (d, J=8.5 Hz, 1H), 7.53 (d, J=7.2 Hz, 2H), 7.36 (d, J=1.5 Hz, 1H), 7.17 (d, J=1.5 Hz, 1H), 7.07 (d, J=7.4 Hz, 1H), 6.98 (dd, J=7.1, 1.8 Hz, 1H), 4.65 (br s, 2H), 3.85 (br s, 2H), 3.65 (s, 3H), 2.83 (br s, 2H), 1.50 (s, 9H).

b) 4-(5-Chloropyridin-2-yl)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride

tert-Butyl 7-(4-(5-chloropyridin-2-yl)-2-oxopyridin-1 (2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (80 mg, 0.16 mmol) was deprotected and converted to the dihydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (40 mg, 54%) as a white solid: ¹H NMR (500 MHz, CD₃OD) δ 8.74 (d, J=2.4 Hz, 1H), 8.06 (d, J=8.5 Hz, 1H), 8.02 (dd, J=8.7, 2.4 Hz, 1H), 7.86 (d, J=7.2 Hz, 1H), 7.64 (d, J=8.3 Hz, 1H), 7.58 (d, J=1.9 Hz, 1H), 7.37 (d, J=1.5 Hz, 1H), 7.27 (dd, J=8.5, 1.8 Hz, 1H), 7.15 (dd, J=8.4, 1.8 Hz, 1H), 4.50 (s, 2H), 3.75 (s, 3H), 3.68 (t, J=6.5 Hz, 2H), 3.22 (t, J=6.5 Hz, 2H); ESI MS m/z 391 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=12.2 min.

Example 59 Preparation of 1-(2,5-Dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-((5-fluoropyridin-2-yl)methoxy)pyridin-2(1H)-one dihydrochloride

4-((5-Fluoropyridin-2-yl)methoxy)-1-(5-methyl-2, 3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (75 mg, 0.19 mmol) was reacted according to the procedure of Example 47 to provide the free-base. Conversion to the dihydrochloride salt using the procedure of Example 30 (step g) provided the title compound (71 mg, 78%) as a white solid: mp 215-230° C.; ¹H NMR (500 MHz, CD₃OD) δ 8.65 (d, J=2.6 Hz, 1H), 7.91 (overlapping ddd, J=9.6, 2.1 Hz, 1H), 7.83-7.20 (m, 2H), 7.61 (d, J=8.4 Hz, 1H), 7.53 (d, J=1.8 Hz, 1H), 7.09 (dd, J=8.4, 1.8 Hz, 1H), 6.59 (dd, J=7.5, 2.6 Hz, 1H), 6.36 (d, J=2.6 Hz, 1H), 5.41 (s, 2H), 4.76 (d, J=14.2 Hz, 1H), 4.39 (d, J=14.2 Hz, 1H), 3.94-3.82 (m, 2H), 3.74 (s, 3H), 3.65-3.58 (m, 2H), 3.13 (s, 3H); ESI MS m/z 419 [M+H]⁺; HPLC (Method B) 95.8% (AUC), t_(R)=11.0 min.

Example 60 Preparation of 4-(5-Chloropyridin-2-yl)-1-(2,5-dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride

4-(5-Chloropyridin-2-yl)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (57 mg, 0.14 mmol) was reacted according to the procedure of Example 47 to provide the free-base. Conversion to the dihydrochloride salt using the procedure of Example 30 (step g) provided the title compound (54.5 mg, 81%) as a yellow solid: ¹H NMR (500 MHz, CD₃OD) δ 8.72 (d, J=1.7 Hz, 1H), 8.03 (d, J=7.9 Hz, 1H), 7.99 (dd, J=8.2, 2.2 Hz, 1H), 7.79 (d, J=7.1 Hz, 1H), 7.61 (d, J=8.3 Hz, 1H), 7.56 (d, J=1.3 Hz, 1H), 7.34 (d, J=1.5 Hz, 1H), 7.19 (dd, J=7.2, 1.8 Hz, 1H), 7.14 (dd, J=8.3, 1.8 Hz, 1H), 4.80-4.72 (br m, 1H), 4.46-4.34 (m, 1H), 3.96-3.86 (m, 1H), 3.75 (s, 3H), 3.65-3.55 (br m, 1H), 3.28 (s, 2H), 3.14 (s, 3H); ESI MS m/z 405 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=12.0 min.

Example 61 Preparation of 4-(Benzyloxy)-1-(5-methyl-2-(2-(pyrrolidin-1-yl)ethyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride

4-(Benzyloxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (180 mg, 0.46 mmol), 1-(2-chloroethyl)pyrrolidine hydrochloride (95 mg, 0.56 mmol), (i-Pr)₂EtN (0.25 mL, 1.4 mmol) were combined in ethanol (2 mL) and heated at 60° C. for 2 h. Purification by preparative HPLC and conversion to the dihydrochloride salt using the procedure of Example 30 (step g) provided the title compound as a white solid: mp 285-289° C.; ¹H NMR (300 MHz, D₂O) δ 7.50 (d, J=8.3 Hz, 1H), 7.46 (d, J=7.7 Hz, 1H), 7.42-7.31 (m, 6H), 6.96 (dd, J=8.3, 1.6 Hz, 1H), 6.27 (dd, J=7.7, 2.6 Hz, 1H), 6.10 (d, J=2.6 Hz, 1H), 5.90 (s, 2H), 4.59 (br s, 2H), 3.81-3.59 (m, 8H), 3.55 (s, 3H), 3.20 (t, J=5.7 Hz, 2H), 3.18-3.05 (br m, 2H), 2.15-1.90 (m, 4H); ESI MS m/z 483 [M+H]⁺; HPLC (Method B) 98.8% (AUC), t_(R)=11.3 min.

Example 62 Preparation of 1-(2,5-Dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one dihydrochloride

1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one (68 mg, 0.16 mmol) was reacted according to the procedure of Example 47 to provide the free-base. Conversion to the dihydrochloride salt using the procedure of Example 30 (step g) provided the title compound (39.6 mg, 48%) as a brown solid: mp 274-280° C.; ¹H NMR (500 MHz, CD₃OD) δ 9.04 (s, 1H), 8.28 (dd, J=8.7, 1.9 Hz, 1H), 8.21 (d, J=2.1 Hz, 1H), 7.83 (d, J=7.1 Hz, 1H), 7.62 (d, J=8.3 Hz, 1H), 7.58 (d, J=1.3 Hz, 1H), 7.39 (d, J=1.6 Hz, 1H), 7.24 (dd, J=7.1, 1.9 Hz, 1H), 7.15 (dd, J=8.3, 1.7 Hz, 1H), 4.80-4.71 (br m, 1H), 4.44-4.35 (br m, 1H), 3.96-3.86 (br m, 1H), 3.75 (s, 3H), 3.67-3.57 (br m, 1H), 3.28 (s, 2H), 3.14 (s, 3H); ESI MS m/z 439 [M+H]⁺; HPLC (Method B) 96.4% (AUC), t_(R)=12.6 min.

Example 63 Preparation of 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(6-methylpyridazin-3-yl)pyridin-2(1H)-one dihydrochloride a) 3-(2-Methoxypyridin-4-yl)-6-methylpyridazine

3-Chloro-6-methylpyridazine (343 mg, 2.67 mmol) and 2-methoxy-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine (470 mg, 2.0 mmol) were reacted according to Example 31 (step a) to provide the title compound (183 mg, 45%) as a cream solid: ¹H NMR (500 MHz, CDCl₃) δ 8.31 (d, J=5.3 Hz, 1H), 7.62 (d, J=8.7 Hz, 1H), 7.59 (dd, J=5.3, 1.5 Hz, 1H), 7.43 (d, J=8.6 Hz, 1H), 7.38 (s, 1H), 4.00 (s, 3H), 2.79 (s, 3H).

b) 4-(6-Methylpyridazin-3-yl)pyridin-2(1H)-one

3-(2-Methoxypyridin-4-yl)-6-methylpyridazine (183 mg, 0.909 mmol) was reacted according to Example 31 (step c) to provide the title compound (133 mg, 75%) as a white solid: ¹H NMR (300 MHz, CD₃OD) δ 8.12 (d, J=8.8 Hz, 1H), 7.73 (d, J=8.8 Hz, 1H), 7.59 (d, J=6.6 Hz, 1H), 7.17-7.14 (m, 2H), 2.75 (s, 3H).

c) tert-Butyl 5-methyl-7-(4-(6-methylpyridazin-3-yl)-2-oxopyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

3-(2-Methoxypyridin-4-yl)-6-methylpyridazine (133 mg, 0.710 mmol) and tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (259 mg, 0.71 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (200 mg, 59%) as a yellow solid: ¹H NMR (300 MHz, CDCl₃) δ 7.83 (d, J=8.7 Hz, 1H), 7.60 (d, J=7.2 Hz, 1H), 7.56 (d, J=8.3 Hz, 1H), 7.48 (d, J=8.8 Hz, 1H), 7.39 (d, J=1.6 Hz, 1H), 7.29 (overlapping ddd, J=7.3, 1.8 Hz, 1H), 7.17 (d, J=1.8 Hz, 1H), 7.11 (d, J=7.6 Hz, 1H), 4.67 (br s, 2H), 3.91-3.83 (br m, 2H), 3.67 (s, 3H), 2.89-2.83 (br m, 2H), 2.53 (s, 3H), 1.52 (s, 9H).

d) 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(6-methylpyridazin-3-yl)pyridin-2(1H)-one dihydrochloride

tert-Butyl 5-methyl-7-(4-(6-methylpyridazin-3-yl)-2-oxopyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (200 mg, 0.42 mmol) was deprotected and converted to the dihydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (57 mg, 33%) as an orange solid: mp 310-315° C.; ¹H NMR (500 MHz, CD₃OD) δ 8.47 (d, J=8.8 Hz, 1H), 8.03 (d, J=8.8 Hz, 1H), 7.89 (d, J=7.4 Hz, 1H), 7.64 (d, J=8.4 Hz, 1H), 7.58 (d, J=1.6 Hz, 1H), 7.35 (d, J=1.6 Hz, 1H), 7.25 (dd, J=7.1, 1.9 Hz, 1H), 7.15 (dd, J=8.3, 1.9 Hz, 1H), 4.49 (s, 2H), 3.75 (s, 3H), 3.68 (t, J=6.2 Hz, 2H), 3.24 (t, J=6.2 Hz, 2H), 2.85 (s, 3H); ESI MS m/z 372 [M+H]⁺; HPLC (Method B) 98% (AUC), t_(R)=9.3 min.

Example 64 Preparation of 1-(2,5-Dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(6-methylpyridazin-3-yl)pyridin-2(1H)-one dihydrochloride

1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(6-methylpyridazin-3-yl)pyridin-2(1H)-one (77 mg, 0.21 mmol) was reacted according to the procedure of Example 47 to provide the free-base. Conversion to the dihydrochloride salt using the procedure of Example 30 (step g) provided the title compound (60 mg, 74%) as a yellow solid: mp 285-288° C.; ¹H NMR (300 MHz, DMSO-d₆) δ 10.9 (s, 1H), 8.32 (d, J=8.8 Hz, 1H), 7.85 (d, J=7.2 Hz, 1H), 7.79 (d, J=8.8 Hz, 1H), 7.64 (d, J=1.5 Hz, 1H), 7.56 (d, J=8.3 Hz, 1H), 7.25 (d, J=1.7 Hz, 1H), 7.14-7.11 (m, 2H), 4.65 (d, J=12.1 Hz, 1H), 4.31 (dd, J=14.2, 7.5 Hz, 1H), 3.81-3.74 (m, 1H), 3.71 (s, 3H), 3.55-3.45 (m, 1H), 3.26-3.15 (m, 2H), 2.98 (s, 3H), 2.72 (s, 3H); ESI MS m/z 386 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=9.4 min.

Example 65 Preparation of 4-(4-Fluoro-2-methoxyphenyl)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) 4-(4-Fluoro-2-methoxyphenyl)pyridine 1-oxide

4-Chloropyridine-N-oxide (305 mg, 2.35 mmol), 4-fluoro-2-methoxyphenylboronic acid (1.0 g, 8.8 mmol) were reacted according to the procedure of Example 39 (step a) to provide the title compound (450 mg, 87%) as a purple solid: ¹H NMR (300 MHz, CDCl₃) δ 8.21 (d, J=7.2 Hz, 2H), 7.45 (d, J=7.2 Hz, 2H), 7.31 (d, J=6.5 Hz, 1H), 6.80-6.71 (m, 2H), 3.85 (s, 3H).

b) 4-(4-Fluoro-2-methoxyphenyl)pyridin-2(1H)-one

4-(4-Fluoro-2-methoxyphenyl)pyridine 1-oxide (450 mg, 2.05 mmol) was reacted according to the procedure of Example 32 (step b) to provide the title compound (291 mg, 66%) as a brown solid: ¹H NMR (300 MHz, DMSO-d₆) δ 11.4 (br s, 1H), 7.39-7.31 (m, 2H), 7.03 (d, J=10.2 Hz, 1H), 6.85 (overlapping dd, J=7.4 Hz, 1H), 6.35 (s, 1H), 6.27 (d, J=6.1 Hz, 1H), 3.80 (s, 3H).

c) tert-Butyl 7-(4-(4-fluoro-2-methoxyphenyl)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

4-(4-Fluoro-2-methoxyphenyl)pyridin-2(1H)-one (100 mg, 0.45 mmol) and tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (166 mg, 0.454 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (106 mg, 46%) as a yellow oil: ¹H NMR (300 MHz, CDCl₃) δ 7.53 (d, J=8.2 Hz, 1H), 7.41 (d, J=7.1 Hz, 1H), 7.39-7.32 (m, 2H), 7.08 (d, J=8.0 Hz, 1H), 6.80-6.70 (m, 3H), 6.46 (dd, J=7.1, 1.9 Hz, 1H), 4.66 (br s, 2H), 3.87 (s, 3H), 3.86-3.78 (m, 2H), 3.64 (s, 3H), 2.83 (t, J=6.1 Hz, 2H), 1.50 (s, 9H).

d) 4-(4-Fluoro-2-methoxyphenyl)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

tert-Butyl 7-(4-(4-fluoro-2-methoxyphenyl)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (106 mg, 0.211 mmol) was deprotected according to the procedure of Example 30 (step e) to provide the free base (74 mg, 88%). The free-base (37 mg, 0.092 mmol) was converted to the hydrochloride salt according to the procedure of Example 30 (steps g) to provide the title compound (35 mg, 89%) as a yellow solid: mp 296-300° C.; ¹H NMR (300 MHz, DMSO-d₆) δ 9.56 (br s, 2H), 7.64 (d, J=7.1 Hz, 1H), 7.62-7.55 (m, 2H), 7.47 (dd, J=8.4, 6.9 Hz, 1H), 7.12-7.06 (m, 2H), 6.90 (overlapping ddd, J=8.4, 2.4 Hz, 1H), 6.55 (d, J=1.6 Hz, 1H), 6.47 (dd, J=7.1, 1.8 Hz, 1H), 4.37-4.30 (br m, 2H), 3.81 (s, 3H), 3.69 (s, 3H), 3.56-3.45 (br m, 2H), 3.10 (t, J=5.5 Hz, 2H); ESI MS m/z 404 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=12.5 min.

Example 66 Preparation of 1-(2,5-Dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(4-fluoro-2-methoxyphenyl)pyridin-2(1H)-one hydrochloride

4-(4-Fluoro-2-methoxyphenyl)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (37 mg, 0.092 mmol) was reacted according to the procedure of Example 47 to provide the free-base. Conversion to the dihydrochloride salt using the procedure of Example 30 (step g) provided the title compound (21 mg, 52%) as a yellow solid: mp 294-298° C.; ¹H NMR (300 MHz, DMSO-d₆) δ 10.83 (br s, 1H), 7.65 (d, J=7.1 Hz, 1H), 7.61 (d, J=1.4 Hz, 1H), 7.54 (d, J=8.3 Hz, 1H), 7.46 (dd, J=8.4, 6.9 Hz, 1H), 7.12-7.10 (m, 1H), 7.08 (d, J=1.4 Hz, 1H), 6.91 (overlapping ddd, J=8.4, 2.4 Hz, 1H), 6.55 (d, J=1.6 Hz, 1H), 6.48 (dd, J=7.1, 1.6 Hz, 1H), 4.62 (d, J=12.2 Hz, 1H), 4.30 (dd, J=14.2, 7.5 Hz, 1H), 3.86 (s, 3H), 3.80-3.76 (m, 1H), 3.75 (s, 3H), 3.52-3.42 (m, 1H), 3.24-3.15 (m, 2H), 2.79 (d, J=4.6 Hz, 3H); ESI MS m/z 418 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=12.6 min.

Example 67 Preparation of 4-(Benzyloxy)-1-(5-methyl-2-(piperidin-4-yl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride a) tert-Butyl 4-(7-(4-(benzyloxy)-2-oxopyridin-1 (2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indol-2(5H)-yl)piperidine-1-carboxylate

4-(Benzyloxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (100 mg, 0.26 mmol) and tert-butyl 4-oxopiperidine-1-carboxylate (27 mg, 0.26 mmol) were stirred in methylene chloride (1 mL) and AcOH (0.1 mL), and picoline borane complex (27 mg, 0.26 mmol) was added. After stirring for 16 h, the mixture was diluted with methylene chloride, washed with sodium carbonate solution and concentrated. The obtained residue was purified by flash column chromatography (silica gel, (1:1 EtOAc/hexanes)/(10:1 methanol/ammonia), 10:0 to 9:1) to provide the title compound (90 mg, 61%) as a white solid: ¹H NMR (300 MHz, CDCl₃) δ 7.45-7.36 (m, 5H), 7.32-7.30 (m, 1H), 7.32-7.27 (m, 2H), 6.99 (dd, J=8.2, 1.6 Hz, 1H), 6.05-6.01 (m, 2H), 5.05 (s, 2H), 4.20 (s, 2H), 3.85 (s, 2H), 3.60 (s, 3H), 3.04-2.93 (m, 2H), 2.88-2.66 (m, 5H), 1.98-1.87 (m, 2H), 1.60-1.54 (m, 2H), 1.47 (s, 9H).

b) 4-(Benzyloxy)-1-(5-methyl-2-(piperidin-4-yl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride

tert-Butyl 4-(7-(4-(benzyloxy)-2-oxopyridin-1 (2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indol-2(5H)-yl)piperidine-1-carboxylate (90 mg, 0.16 mmol) was deprotected and converted to the dihydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (85 mg, 100%) as an orange solid: ¹H NMR (500 MHz, D₂O) δ 7.56-7.53 (m, 2H), 7.48-7.40 (m, 6H), 7.02 (dd, J=8.4, 1.4 Hz, 1H), 6.33 (dd, J=7.5, 2.4 Hz, 1H), 6.17 (d, J=2.4 Hz, 1H), 5.16 (s, 2H), 4.63 (br s, 2H), 4.09-3.79 (br m, 2H), 3.69-3.53 (m, 6H), 3.26-3.23 (m, 2H), 3.14 (t, J=12.8 Hz, 2H), 2.49 (d, J=1.3 Hz, 2H), 2.16-2.04 (m, 2H); ESI MS m/z 469 [M+H]⁺; HPLC (Method B) 98.1% (AUC), t_(R)=11.4 min.

Example 68 Preparation of 4-(Benzyloxy)-1-(5-methyl-2-(1-methylpiperidin-4-yl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride

4-(Benzyloxy)-1-(5-methyl-2-(piperidin-4-yl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (50 mg, 0.11 mmol) was methylated according to the procedure of Example 47 to provide the title compound (30 mg, 51%) as a white solid: ¹H NMR (500 MHz, D₂O) δ 7.56-7.52 (m, 2H), 7.48-7.38 (m, 6H), 7.02 (dd, J=8.3, 1.6 Hz, 1H), 6.33 (dd, J=7.5, 2.6 Hz, 1H), 6.16 (d, J=2.5 Hz, 1H), 5.16 (s, 2H), 4.63 (s, 2H), 3.85-3.83 (m, 2H), 3.74-3.71 (m, 2H), 3.62 (s, 3H), 3.26-3.14 (m, 5H), 2.89 (s, 3H), 2.55-2.50 (m, 2H), 2.19-2.12 (m, 2H); ESI MS m/z 483 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=11.4 min.

Example 69 Preparation of 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(6-(trifluoromethyl)pyridin-3-yl)pyridin-2(1H)-one dihydrochloride a) 2′-Methoxy-6-(trifluoromethyl)-3,4′-bipyridine

2-Methoxy-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine (1.24 g, 0.53 mmol) and 5-bromo-2-(trifluoromethyl)pyridine (2.4 g, 11 mmol) were reacted according to the procedure of Example 31 (step a) to provide the title compound (1.1 g, 81%) as a white solid: ESI MS m/z 255 [M+H].

b) 4-(6-(Trifluoromethyl)pyridin-3-yl)pyridin-2(1H)-one

2′-Methoxy-6-(trifluoromethyl)-3,4′-bipyridine (1.1 g, 4.3 mmol) was reacted according to the procedure of Example 31 (step c) to provide the title compound (522 mg, 50%) as a white solid: ¹H NMR (500 MHz, DMSO-d₆) δ 11.8 (br s, 1H), 9.10 (s, 1H), 8.40 (dd, J=8.1, 1.2 Hz, 1H), 8.00 (d, J=8.2 Hz, 1H), 7.56 (d, J=6.7 Hz, 1H), 6.81 (s, 1H), 6.63 (dd, J=6.7, 1.3 Hz, 1H).

c) tert-Butyl 5-methyl-7-(2-oxo-4-(6-(trifluoromethyl)pyridin-3-yl)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

4-(6-(Trifluoromethyl)pyridin-3-yl)pyridin-2(1H)-one (131 mg, 0.54 mmol) and tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (200 mg, 0.54 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (167 mg, 59%) as a green solid: ¹H NMR (300 MHz, CDCl₃) δ 8.99 (d, J=2.0 Hz, 1H), 8.10 (dd, J=8.1, 1.8 Hz, 1H), 7.84 (d, J=8.2 Hz, 1H), 7.60-7.54 (m, 2H), 7.32 (d, J=1.9 Hz, 1H), 7.07 (d, J=8.0 Hz, 1H), 6.93 (d, J=1.8 Hz, 1H), 6.49 (dd, J=7.1, 2.0 Hz, 1H), 4.66 (s, 2H), 3.85 (br m, 2H), 3.65 (s, 3H), 2.84 (s, 2H), 1.50 (s, 9H).

d) 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(6-(trifluoromethyl)pyridin-3-yl)pyridin-2(1H)-one dihydrochloride

tert-Butyl 5-methyl-7-(2-oxo-4-(6-(trifluoromethyl)pyridin-3-yl)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (165 mg, 0.315 mmol) was deprotected and converted to the dihydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (40 mg, 26%) as a yellow solid: ¹H NMR (300 MHz, CD₃OD) δ 9.10 (d, J=2.0 Hz, 1H), 8.41 (dd, J=8.2, 1.7 Hz, 1H), 7.98 (d, J=8.2 Hz, 1H), 7.85 (d, J=7.2 Hz, 1H), 7.61 (d, J=8.2 Hz, 1H), 7.57 (d, J=1.6 Hz, 1H), 7.14 (dd, J=8.3, 1.9 Hz, 1H), 7.02 (d, J=1.6 Hz, 1H), 6.89 (dd, J=7.1, 2.0 Hz, 1H), 4.49 (s, 2H), 3.76 (s, 3H), 3.68 (t, J=6.2 Hz, 2H), 3.22 (t, J=6.2 Hz, 2H); ESI MS m/z 425 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=12.3 min.

Example 70 Preparation of 1-(2,5-Dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(6-(trifluoromethyl)pyridin-3-yl)pyridin-2(1H)-one

1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(6-(trifluoromethyl)pyridin-3-yl)pyridin-2(1H)-one (77 mg, 0.18 mmol) was reacted according to the procedure of Example 47 and converted to the dihydrochloride to provide the title compound (27 mg, 29%) as a yellow solid: mp 295-300° C.; ¹H NMR (500 MHz, CD₃OD) δ 9.09 (d, J=1.7 Hz, 1H), 8.42 (dd, J=8.1, 2.0 Hz, 1H), 7.97 (d, J=8.2 Hz, 1H), 7.85 (d, J=7.1 Hz, 1H), 7.62 (d, J=8.3 Hz, 1H), 7.58 (d, J=1.5 Hz, 1H), 7.15 (dd, J=8.3, 1.8 Hz, 1H), 7.02 (d, J=1.8 Hz, 1H), 6.89 (dd, J=7.1, 2.0 Hz, 1H), 4.79-4.37 (br m, 2H), 3.90-3.60 (br m, 5H), 3.30 (br m, 2H), 3.14 (s, 3H); ESI MS m/z 439 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=12.4 min.

Example 71 Preparation of 1-(2,3,4,5-Tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one dihydrochloride a) tert-Butyl 7-bromo-5-tosyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

tert-Butyl 7-bromo-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (1.07 g, 3.04 mmol) was reacted according to the procedure of Example 87 (step a) to provide the title compound (1.39 g, 91%) as a white solid: ¹H NMR (300 MHz, CDCl₃) δ 8.35 (s, 1H), 7.66 (d, J=6.6 Hz, 2H), 7.35 (d, J=8.2 Hz, 1H), 7.28-7.21 (m, 2H), 7.18 (d, J=8.1 Hz, 1H), 4.47 (s, 2H), 3.77-3.65 (br m, 2H), 3.11-3.03 (br m, 2H), 2.36 (s, 3H), 1.48 (s, 9H).

b) tert-Butyl 7-(2-oxo-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-1(2H)-yl)-5-tosyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

4-(5-(Trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one (131 mg, 0.545 mmol) and tert-butyl 7-bromo-5-tosyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (255 mg, 0.505 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (125 mg, 34%) as a yellow oil: ¹H NMR (300 MHz, CDCl₃) δ 9.01 (s, 1H), 8.29 (d, J=1.6 Hz, 1H), 8.08 (dd, J=8.3, 1.9 Hz, 1H), 7.92 (d, J=8.3 Hz, 1H), 7.74 (d, J=8.3 Hz, 1H), 7.57 (d, J=7.2 Hz, 1H), 7.46 (d, J=8.2 Hz, 1H), 7.33 (dd, J=8.2, 1.6 Hz, 1H), 7.29-7.23 (m, 4H), 7.09 (dd, J=7.2, 1.8 Hz, 1H), 4.52 (s, 2H), 3.80-3.73 (br m, 2H), 3.18-3.09 (br m, 2H), 2.35 (s, 3H), 1.50 (s, 9H).

b) 1-(5-Tosyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one trifluoroacetic acid salt

tert-Butyl 7-(2-oxo-4-(5-(trifluoromethyl)pyridin-2-yl)pyri din-1(2H)-yl)-5-tosyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (165 mg, 0.248 mmol) was stirred in TFA (3 mL) and methylene chloride (1 mL) for 3 h. Concentration of the solution under reduced pressure provided the title compound (164 mg, 100%) as a yellow oil; ESI MS m/z 565 [M+H]⁺.

c) 1-(2,3,4,5-Tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one dihydrochloride

1-(5-Tosyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one trifluoroacetic acid salt (163 mg, 0.248 mmol) was deprotected and converted to the dihydrochloride salt according to the procedure of Example 106 (step b) to provide the title compound (30 mg, 25%) as an orange solid: mp 308-313° C.; ¹H NMR (500 MHz, CD₃OD) δ 9.04 (s, 1H), 8.28 (dd, J=8.3, 2.2 Hz, 1H), 8.22 (d, J=8.2 Hz, 1H), 7.81 (d, J=7.0 Hz, 1H), 7.62 (d, J=8.3 Hz, 1H), 7.46 (d, J=1.8 Hz, 1H), 7.38 (d, J=1.8 Hz, 1H), 7.24 (dd, J=7.1, 2.0 Hz, 1H), 7.11 (dd, J=8.3, 2.0 Hz, 1H), 4.49 (s, 2H), 3.65 (t, J=6.2 Hz, 2H), 3.21 (t, J=6.2 Hz, 2H); ESI MS m/z 411 [M+H]⁺; HPLC (Method B) 97.6% (AUC), t_(R)=12.4 min.

Example 72 Preparation of 1-(2,3,4,5-Tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(6-(trifluoromethyl)pyridazin-3-yl)pyridin-2(1H)-one hydrochloride a) tert-Butyl 7-bromo-5-(triisopropylsilyl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

tert-Butyl 7-bromo-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (300 mg, 0.85 mmol) was dissolved in DMF (3 mL), and NaH (60% weight dispersion in mineral oil, 40 mg, 1.02 mmol) and TIPSCl (164 mg, 1.02 mmol) were added. After stirring for 1 h, the mixture was poured into water and extracted with EtOAc. Concentration of the organic extracts and purification of the residue by flash column chromatography (silica gel, EtOAc/hexanes) provided the title compound (262 mg, 61%) as a clear oil: ¹H NMR (300 MHz, CDCl₃) δ 7.70 (s, 1H), 7.25 (d, J=8.2 Hz, 1H), 7.19 (dd, J=8.2, 1.4 Hz, 1H), 4.59 (s, 2H), 3.76-3.71 (br m, 2H), 2.96-2.90 (br m, 2H), 1.81-1.71 (m, 3H), 1.51 (s, 9H), 1.15 (d, J=7.5 Hz, 18H).

b) tert-Butyl 7-(2-oxo-4-(6-(trifluoromethyl)pyridazin-3-yl)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

tert-Butyl 7-bromo-5-(triisopropylsilyl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (260 mg, 0.51 mmol) and 4-(6-(trifluoromethyl)pyridazin-3-yl)pyridin-2(1H)-one (123 mg, 0.510 mmol) were reacted according to the procedure of Example 30 (step g) to provide the title compound (80 mg, 30%) as a yellow solid: ESI MS m/z 512 [M+H]⁺.

c) 1-(2,3,4,5-Tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(6-(trifluoromethyl)pyridazin-3-yl)pyridin-2(1H)-one hydrochloride

tert-Butyl 7-(2-oxo-4-(6-(trifluoromethyl)pyridazin-3-yl)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (80 mg, 0.15 mmol) was deprotected and converted to the hydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (30 mg, 44%) as an orange solid: mp 314-318° C.; ¹H NMR (300 MHz, CD₃OD) δ 8.52 (d, J=8.9 Hz, 1H), 8.28 (d, J=8.9 Hz, 1H), 7.89 (d, J=7.2 Hz, 1H), 7.62 (d, J=8.3 Hz, 1H), 7.48 (d, J=1.5 Hz, 1H), 7.43 (d, J=1.5 Hz, 1H), 7.33 (dd, J=7.2, 2.0 Hz, 1H), 7.14 (dd, J=7.4, 2.0 Hz, 1H), 4.49 (s, 2H), 3.65 (t, J=6.2 Hz, 2H), 3.21 (t, J=6.2 Hz, 2H); ESI MS m/z 412 [M+H]⁺; HPLC (Method B) 96.0% (AUC), t_(R)=11.6 min.

Example 73 Preparation of 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(2-(trifluoromethyl)pyrimidin-5-yl)pyridin-2(1H)-one hydrochloride a) 5-(2-Methoxypyridin-4-yl)-2-(trifluoromethyl)pyrimidine

2-Methoxy-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine (2.0 g, 8.5 mmol) and 5-chloro-2-(trifluoromethyl)pyrimidine (2.3 g, 13 mmol) were reacted according to the procedure of Example 31 (step a) to provide the title compound (1.0 g, 46%) as a white solid: ¹H NMR (300 MHz, CDCl₃) δ 9.10 (s, 2H), 8.35 (d, J=5.5 Hz, 1H), 7.11 (dd, J=5.5, 1.6 Hz, 1H), 6.98 (d, J=1.6 Hz, 1H), 4.02 (s, 3H).

b) 4-(2-(Trifluoromethyl)pyrimidin-5-yl)pyridin-2(1H)-one

5-(2-Methoxypyridin-4-yl)-2-(trifluoromethyl)pyrimidine (900 mg, 3.5 mmol) was reacted according to the procedure of Example 31 (step c) to provide the title compound (470 mg, 56%) as an orange solid: ¹H NMR (300 MHz, DMSO-d₆) δ 11.6 (br s, 1H), 9.41 (s, 2H), 7.61 (d, J=6.8 Hz, 1H), 6.91 (s, 1H), 6.68 (dd, J=6.8, 1.6 Hz, 1H).

c) tert-Butyl 5-methyl-7-(2-oxo-4-(2-(trifluoromethyl)pyrimidin-5-yl)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

4-(2-(Trifluoromethyl)pyrimidin-5-yl)pyridin-2(1H)-one (100 mg, 0.42 mmol) and tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (116 mg, 0.32 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (41 mg, 24%) as a yellow oil: ESI MS m/z 526 [M+H]⁺.

d) 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(2-(trifluoromethyl)pyrimidin-5-yl)pyridin-2(1H)-one hydrochloride

tert-Butyl 5-methyl-7-(2-oxo-4-(2-(trifluoromethyl)pyrimidin-5-yl)pyridin-1 (2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (41 mg, 0.078 mmol) was deprotected and converted to the hydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (29 mg, 80%) as a yellow solid: ¹H NMR (500 MHz, DMSO-d₆) δ 9.51 (s, 2H), 9.37 (br s, 2H), 7.90 (d, J=7.2 Hz, 1H), 7.62-7.60 (m, 2H), 7.13 (d, J=1.9 Hz, 1H), 7.10 (dd, J=8.3, 1.7 Hz, 1H), 6.88 (dd, J=7.1, 2.0 Hz, 1H), 4.38-4.34 (br m, 2H), 3.70 (s, 3H), 3.56-3.50 (br m, 2H), 3.11 (t, J=5.8 Hz, 2H); ESI MS m/z 426 [M+H]⁺; HPLC (Method B) >100% (AUC), t_(R)=12.2 min.

Example 74 Preparation of 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(5-(trifluoromethyl)pyrimidin-2-yl)pyridin-2(1H)-one hydrochloride a) 2-(2-Methoxypyridin-4-yl)-5-(trifluoromethyl)pyrimidine

2-Methoxy-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine (1.66 g, 7.06 mmol) and 2-chloro-5-(trifluoromethyl)pyrimidine (1.3 g, 7.1 mmol) were reacted according to the procedure of Example 31 (step a) to provide the title compound (307 mg, 16%) as a white solid: ¹H NMR (300 MHz, CDCl₃) δ 9.08 (s, 2H), 8.34 (d, J=5.3 Hz, 1H), 7.89 (dd, J=5.3, 1.4 Hz, 1H), 7.81 (s, 1H), 4.01 (s, 3H).

b) 4-(5-(Trifluoromethyl)pyrimidin-2-yl)pyridin-2(1H)-one

2-(2-Methoxypyridin-4-yl)-5-(trifluoromethyl)pyrimidine (400 mg, 1.56 mmol) was reacted according to the procedure of Example 31 (step c) to provide the title compound (200 mg, 63%) as a white solid: ¹H NMR (300 MHz, DMSO-d₆) δ 11.9 (br s, 1H), 9.43 (s, 2H), 7.58 (d, J=6.8 Hz, 1H), 7.34 (s, 1H), 7.06 (dd, J=6.8, 1.7 Hz, 1H).

c) tert-Butyl 5-methyl-7-(2-oxo-4-(5-(trifluoromethyl)pyrimidin-2-yl)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

4-(5-(Trifluoromethyl)pyrimidin-2-yl)pyridin-2(1H)-one (100 mg, 0.34 mmol) and tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (124 mg, 0.339 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (70 mg, 39%) as a yellow solid: ¹H NMR (300 MHz, CDCl₃) δ 9.11 (s, 2H), 7.86 (s, 1H), 7.59-7.53 (m, 2H), 7.38 (s, 1H), 7.28-7.26 (m, 1H), 7.08 (d, J=8.4 Hz, 1H), 4.89-4.63 (br m, 2H), 3.90-3.80 (br m, 2H), 3.65 (s, 3H), 2.88-2.79 (br m, 2H), 1.50 (s, 9H).

d) 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(5-(trifluoromethyl)pyrimidin-2-yl)pyridin-2(1H)-one hydrochloride

tert-Butyl 5-methyl-7-(2-oxo-4-(5-(trifluoromethyl)pyrimidin-2-yl)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (70 mg, 0.13 mmol) was deprotected and converted to the hydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (51 mg, 87%) as a yellow solid: mp 301-309° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 9.48 (s, 2H), 9.37 (br s, 2H), 7.89 (d, J=7.2 Hz, 1H), 7.65 (d, J=1.6 Hz, 1H), 7.61 (d, J=8.3 Hz, 1H), 7.50 (d, J=1.6 Hz, 1H), 7.21 (dd, J=7.6, 1.9 Hz, 1H), 7.12 (dd, J=8.3, 1.8 Hz, 1H), 4.41-4.31 (br m, 2H), 3.71 (s, 3H), 3.51-3.48 (br m, 2H), 3.10 (t, J=5.6 Hz, 2H); ESI MS m/z 426 [M+H]⁺; HPLC (Method B) 97.9% (AUC), t_(R)=12.6 min.

Example 75 Preparation of 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-((6-(trifluoromethyl)pyridin-3-yl)methoxy)pyridin-2(1H)-one hydrochloride a) 2-Methoxy-4-((6-(trifluoromethyl)pyridin-3-yl)methoxy)pyridine

4-BromoBromo-2-methoxypyridine (3.06 g, 16.2 mmol), (6-(trifluoromethyl)pyridin-3-yl)methanol (2.74 g, 15.5 mmol), 3,4,7,8-tetramethylphenanthroline (0.36 g, 0.15 mmol), CuI (0.14 g, 0.74 mmol) and Cs₂CO₃ (7.57 g, 23.2 mmol) were combined in toluene (15 mL) and heated to reflux under a nitrogen atmosphere for 16 h. Upon cooling the mixture was purified by flash column chromagraphy (silica gel, hexanes/EtOAc, 1:0 to 1:1) to provide the title compound (3.19 g, 72%) as a red oil: ¹H NMR (300 MHz, CDCl₃) δ 8.78 (s, 1H), 8.02 (d, J=5.9 Hz, 1H), 7.95 (d, J=8.1 Hz, 1H), 7.32 (d, J=8.0 Hz, 1H), 6.55 (dd, J=5.9, 2.2 Hz, 1H), 6.26 (d, J=2.2 Hz, 1H), 5.16 (s, 2H), 3.93 (s, 3H).

b) 4-((6-(Trifluoromethyl)pyridin-3-yl)methoxy)pyridin-2(1H)-one

2-Methoxy-4-((6-(trifluoromethyl)pyridin-3-yl)methoxy)pyridine (3.19 g, 11.2 mmol) was reacted according to the procedure of Example 31 (step c) to provide the title compound (2.04 g, 67%) as a white solid: ¹H NMR (300 MHz, DMSO-d₆) δ 11.2 (br s, 1H), 8.84 (s, 1H), 8.14 (d, J=8.5 Hz, 1H), 7.96 (d, J=8.0 Hz, 1H), 7.28 (d, J=7.3 Hz, 1H), 5.95 (dd, J=7.3, 2.5 Hz, 1H), 5.82 (d, J=2.4 Hz, 1H), 5.25 (s, 2H).

c) tert-Butyl 5-methyl-7-(2-oxo-4-((6-(trifluoromethyl)pyridin-3-yl)methoxy)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

4-((6-(Trifluoromethyl)pyridin-3-yl)methoxy)pyridin-2(1H)-one (177 mg, 0.655 mmol) and tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (200 mg, 0.54 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (120 mg, 40%) as a yellow oil: ¹H NMR (300 MHz, CDCl₃) δ 8.80 (s, 1H), 7.95 (d, J=8.1 Hz, 1H), 7.76 (d, J=8.0 Hz, 1H), 7.51 (d, J=7.9 Hz, 1H), 7.35 (d, J=8.0 Hz, 1H), 7.28 (m, 1H), 7.01 (d, J=8.1 Hz, 1H), 6.06-6.04 (m, 2H), 5.16 (s, 2H), 4.65-4.60 (br m, 2H), 3.89-3.79 (br m, 2H), 3.63 (s, 3H), 2.87-2.78 (br m, 2H), 1.50 (s, 9H).

d) 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-((6-(trifluoromethyl)pyridin-3-yl)methoxy)pyridin-2(1H)-one dihydrochloride

tert-Butyl 5-methyl-7-(2-oxo-4-((6-(trifluoromethyl)pyridin-3-yl)methoxy)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (120 mg, 0.21 mmol) was deprotected and converted to the dihydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (90 mg, 81%) as a white solid: mp 286-291° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 9.54 (br s, 2H), 8.89 (s, 1H), 8.19 (dd, J=7.9, 1.4 Hz, 1H), 8.00 (d, J=8.0 Hz, 1H), 7.60 (d, J=7.6 Hz, 1H), 7.55 (d, J=8.3 Hz, 1H), 7.50 (d, J=1.7 Hz, 1H), 6.98 (dd, J=8.3, 1.8 Hz, 1H), 6.15 (dd, J=7.5, 2.7 Hz, 1H), 6.02 (d, J=2.7 Hz, 1H), 5.35 (s, 2H), 4.35-4.30 (br m, 2H), 3.67 (s, 3H), 3.53-3.47 (br m, 2H), 3.09 (t, J=5.8 Hz, 2H); ESI MS m/z 455 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=12.7 min.

Example 76 Preparation of 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-((5-(trifluoromethyl)pyridin-2-yl)methoxy)pyridin-2(1H)-one a) tert-Butyl 5-methyl-7-(2-oxo-4-((5-(trifluoromethyl)pyridin-2-yl)methoxy)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

2-(Bromomethyl)-5-(trifluoromethyl)pyridine (140 mg, 0.58 mmol), tert-butyl 7-(4-hydroxy-2-oxopyridin-1 (2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (230 mg, 0.58 mmol) and K₂CO₃ (160 mg, 1.16 mmol) were stirred in acetonitrile/DMF (3 mL/0.5 mL) for 72 h. The mixture was diluted with methylene chloride, washed with water and concentrated to provide the title compound (96 mg, 29%) as a yellow solid: ¹H NMR (300 MHz, CDCl₃) δ 8.88 (s, 1H), 8.00 (dd, J=8.2, 2.0 Hz, 1H), 7.63 (d, J=8.2 Hz, 1H), 7.51 (d, J=8.2 Hz, 1H), 7.36 (d, J=7.6 Hz, 1H), 7.28-7.26 (m, 1H), 7.00 (d, J=7.7 Hz, 1H), 6.12 (dd, J=7.6, 2.7 Hz, 1H), 6.04 (d, J=2.7 Hz, 1H), 5.26 (s, 2H), 4.63-4.58 (br m, 2H), 3.87-3.76 (br m, 2H), 3.63 (s, 3H), 2.86-2.76 (br m, 2H), 1.50 (s, 9H).

b) 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-((5-(trifluoromethyl)pyridin-2-yl)methoxy)pyridin-2(1H)-one dihydrochloride

tert-Butyl 5-methyl-7-(2-oxo-4-((5-(trifluoromethyl)pyridin-2-yl)methoxy)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (90 mg, 0.16 mmol) was deprotected and converted to the dihydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (76 mg, 90%) as a white solid: mp 296-300° C.; ¹H NMR (300 MHz, CD₃OD) δ 8.93 (s, 1H), 8.23 (dd, J=8.2, 2.1 Hz, 1H), 7.82 (d, J=8.2 Hz, 1H), 7.70 (d, J=7.5 Hz, 1H), 7.59 (d, J=8.3 Hz, 1H), 7.49 (d, J=1.7 Hz, 1H), 7.06 (dd, J=8.3, 1.8 Hz, 1H), 6.47 (dd, J=7.5, 2.7 Hz, 1H), 6.20 (d, J=2.6 Hz, 1H), 5.42 (s, 2H), 4.48 (s, 2H), 3.73 (s, 3H), 3.67 (t, J=6.1 Hz, 2H), 3.20 (t, J=6.1 Hz, 2H); ESI MS m/z 455 [M+H]⁺; HPLC (Method B) 97.6% (AUC), t_(R)=12.6 min.

Example 77 Preparation of 5-(Benzyloxy)-2-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridazin-3(2H)-one hydrochloride a) 5-(Benzyloxy)pyridazin-3 (2H)-one

CAS Registry Number 1008517-73-4

This compound was prepared in accordance with the procedure of Stenkamp et al., WO 2008/022979.

b) tert-Butyl 7-(4-(benzyloxy)-6-oxopyridazin-1(6H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

5-(Benzyloxy)pyridazin-3(2H)-one (100 mg, 0.5 mmol) and tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (180 mg, 0.5 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (106 mg, 43%) as a solid: ESI MS m/z 487 [M+H]⁺.

c) 5-(Benzyloxy)-2-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridazin-3(2H)-one hydrochloride

tert-Butyl 7-(4-(benzyloxy)-6-oxopyridazin-1 (6H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (100 mg, 0.2 mmol) was deprotected and converted to the hydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (30 mg, 35%) as a white solid: mp 261-265° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 9.23 (s, 2H), 7.96 (d, J=2.8 Hz, 1H), 7.59 (d, J=1.6 Hz, 1H), 7.54 (d, J=8.4 Hz, 1H), 7.51-7.48 (m, 2H), 7.46-7.42 (m, 2H), 7.40 (d, J=7.5 Hz, 1H), 7.13 (dd, J=8.4, 1.7 Hz, 1H), 6.51 (d, J=2.8 Hz, 1H), 5.22 (s, 2H), 4.34 (s, 2H), 3.69 (s, 3H), 3.52 (t, J=5.8 Hz, 2H), 3.09 (t, J=5.8 Hz, 2H); ESI MS m/z 387 [M+H]⁺; HPLC (Method B) 97.7% (AUC), t_(R)=12.8 min.

Example 78 Preparation of 2-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-5-(4-(trifluoromethyl)phenyl)pyridazin-3(2H)-one hydrochloride a) 5-Hydroxy-2-(tetrahydro-2H-pyran-2-yl)pyridazin-3 (2H)-one

CAS Registry Number 1008517-74-5

This compound was prepared in accordance with the procedure of Stenkamp et al., WO 2008/022979.

b) 6-Oxo-1-(tetrahydro-2H-pyran-2-yl)-1,6-dihydropyridazin-4-yl trifluoromethanesulfonate

5-Hydroxy-2-(tetrahydro-2H-pyran-2-yl)pyridazin-3(2H)-one (2.4 g, 13 mmol) dissolved in methylene chloride (75 mL) and cooled to 0° C. Triethylamine (3.5 mL, 25 mmol) and Tf₂O (2.3 mL, 14 mmol) were added and the mixture stirred for a further 2.5 h. Saturated NaHCO₃ solution was added and the organic phase removed, dried over Na₂SO₄ and concentrated. Purification by flash column chromaotgraphy (silica gel, EtOAc/hexanes) provided the title compound (2.47 g, 60%) as a yellow oil: ¹H NMR (500 MHz, CDCl₃) δ 7.85 (d, J=2.8 Hz, 1H), 6.86 (d, J=2.7 Hz, 1H), 6.01 (dd, J=10.2, 2.2 Hz, 1H), 4.15-4.12 (m, 1H), 3.75 (dt, J=11.6, 2.5 Hz, 1H), 2.18-2.02 (m, 2H), 1.78-1.66 (m, 3H), 1.62-1.55 (m, 1H).

c) 2-(Tetrahydro-2H-pyran-2-yl)-5-(4-(trifluoromethyl)phenyl)pyridazin-3 (2H)-one

6-Oxo-1-(tetrahydro-2H-pyran-2-yl)-1,6-dihydropyridazin-4-yl trifluoromethanesulfonate (2.47 g, 7.5 mmol) and 4-trifluoromethylphenylboronic acid (2.56 g, 15 mmol) were reacted according to the procedure of Example 31 (step a) to provide the title compound (500 mg, 20%) as a white solid: ESI MS m/z 325 [M+H]⁺.

d) 5-(4-(Trifluoromethyl)phenyl)pyridazin-3 (2H)-one

2-(Tetrahydro-2H-pyran-2-yl)-5-(4-(trifluoromethyl)phenyl)pyridazin-3(2H)-one (500 mg, 1.54 mmol) was reacted according to the procedure of Example 31 (step c) to provide the title compound (100 mg, 27%) as a solid: ESI MS m/z 241 [M+H]⁺.

e) tert-Butyl 5-methyl-7-(6-oxo-4-(4-(trifluoromethyl)phenyl)pyridazin-1(6H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

5-(4-(Trifluoromethyl)phenyl)pyridazin-3 (2H)-one (100 mg, 0.41 mmol) and tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (151 mg, 0.41 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (65 mg, 30%) as a yellow solid: ¹H NMR (300 MHz, CDCl₃) δ 8.20 (s, 1H), 7.81 (d, J=8.4 Hz, 2H), 7.76 (d, J=8.4 Hz, 2H), 7.59 (d, J=1.6 Hz, 1H), 7.54 (d, J=8.4 Hz, 1H), 7.31 (d, J=6.9 Hz, 1H), 7.26-7.24 (m, 1H), 4.62 (s, 2H), 3.89-3.80 (br m, 2H), 3.66 (s, 3H), 2.84 (br m, 2H), 1.51 (s, 9H).

f) 2-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-5-(4-(trifluoromethyl)phenyl)pyridazin-3 (2H)-one hydrochloride

tert-Butyl 5-methyl-7-(6-oxo-4-(4-(trifluoromethyl)phenyl)pyridazin-1(6H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (65 mg, 0.12 mmol) was deprotected and converted to the hydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (47 mg, 80%) as an orange solid: mp 315-320° C.; ¹H NMR (300 MHz, DMSO-d₆) δ 9.37 (s, 2H), 8.56 (d, J=2.2 Hz, 1H), 8.13 (d, J=Hz, 2H), 7.93 (d, J=8.2 Hz, 2H), 7.72 (d, J=1.6 Hz, 1H), 7.61 (d, J=8.4 Hz, 1H), 7.48 (d, J=2.2 Hz, 1H), 7.25 (dd, J=8.4, 1.8 Hz, 1H), 4.36 (s, 2H), 3.70 (s, 3H), 3.58-3.48 (br m, 2H), 3.11 (t, J=5.7 Hz, 2H); ESI MS m/z 425 [M+H]⁺; HPLC (Method A) 96.6% (AUC), t_(R)=15.7 min.

Example 79 Preparation of 4-(5-Chloropyridin-2-yl)-1-(9-methyl-2,3,4,5-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) tert-Butyl 7-(4-(5-chloropyridin-2-yl)-2-oxopyridin-1(2H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

tert-Butyl 7-bromo-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (200 mg, 0.549 mmol) and 4-(5-chloropyridin-2-yl)pyridin-2(1H)-one (87 mg, 0.42 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (97 mg, 47%) as a yellow solid: ¹H NMR (300 MHz, CDCl₃) δ 8.69 (d, J=2.0 Hz, 1H), 7.80 (dd, J=8.5, 2.3 Hz, 1H), 7.75 (d, J=8.4 Hz, 1H), 7.55 (overlapping dd, J=7.4 Hz, 2H), 7.36 (s, 1H), 7.18 (d, J=1.7 Hz, 1H), 7.08 (dd, J=8.3, 1.6 Hz, 1H), 7.00 (dd, J=7.1, 1.8 Hz, 1H), 4.65 (s, 2H), 3.76 (br m, 2H), 3.65 (s, 3H), 2.82 (br m, 2H), 1.52 (s, 9H).

b) 4-(5-Chloropyridin-2-yl)-1-(9-methyl-2,3,4,5-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

tert-Butyl 7-(4-(5-chloropyridin-2-yl)-2-oxopyridin-1 (2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(5H)-carboxylate (97 mg, 0.20 mmol) was deprotected and converted to the hydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound as a orange solid (68 mg, 88%): mp 310-320° C.; ¹H NMR (500 MHz, CD₃OD) δ 8.73 (dd, J=2.4, 0.6 Hz, 1H), 8.03 (dd, J=8.5, 0.5 Hz, 1H), 8.00 (dd, J=8.5, 2.4 Hz, 1H), 7.80 (d, J=7.1 Hz, 1H), 7.67 (d, J=8.3 Hz, 1H), 7.56 (d, J=1.7 Hz, 1H), 7.31 (d, J=1.7 Hz, 1H), 7.19 (dd, J=7.1, 2.0 Hz, 1H), 7.14 (dd, J=8.4, 1.8 Hz, 1H), 4.56 (s, 2H), 3.74 (s, 3H), 3.61 (t, J=6.1 Hz, 2H), 3.14 (t, J=6.1 Hz, 2H); ESI MS m/z 391 [M+H]⁺; HPLC (Method A) >99% (AUC), t_(R)=11.9 min.

Example 80 Preparation of 1-(2,9-Dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(5-chloropyridin-2-yl)pyridin-2(1H)-one hydrochloride

4-(5-Chloropyridin-2-yl)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one (104 mg, 0.266 mmol) was reacted following the procedure of Example 47 to provide the title compound (75 mg, 70%) as a yellow solid: mp 283-295° C.; ¹H NMR (500 MHz, CD₃OD) δ 8.73 (d, J=2.3 Hz, 1H), 8.03 (d, J=8.5 Hz, 1H) 7.99 (dd, J=8.5, 2.3 Hz, 1H), 7.79 (d, J=7.2 Hz, 1H), 7.67 (d, J=8.3 Hz, 1H), 7.57 (s, 1H), 7.31 (d, J=1.6 Hz, 1H), 7.19 (dd, J=7.1, 1.8 Hz, 1H), 7.15 (dd, J=8.3, 1.7 Hz, 1H), 4.65 (br s, 2H), 3.74 (m, 5H), 3.21 (t, J=5.7 Hz, 2H), 3.17 (s, 3H); ESI MS m/z 405 [M+H]⁺; HPLC (Method B) 98.7% (AUC), t_(R)=12.1 min.

Example 81 Preparation of 4-(5-(Trifluoromethyl)pyridin-2-yl)-1-(9-methyl-2,3,4,5-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) tert-Butyl 9-methyl-7-(2-oxo-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

tert-Butyl 7-bromo-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (100 mg, 0.417 mmol) and 4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one (197 mg, 0.542 mmol), were reacted following the procedure of Example 30 (step g) to provide the title compound (168 mg, 66%) as a yellow solid: ¹H NMR (300 MHz, CDCl₃) δ 9.00 (s, 1H), 8.07 (dd, J=8.3, 1.9 Hz, 1H), 7.90 (d, J=8.3 Hz, 1H), 7.58 (overlapping dd, J=7.1 Hz, 2H), 7.37 (s, 1H), 7.26 (d, 1H under solvent), 7.08 (dd, J=8.3, 1.7 Hz, 1H), 7.03 (dd, J=7.1, 1.9 Hz, 1H), 4.66 (s, 2H), 3.76 (br m, 2H), 3.65 (s, 3H), 2.82 (br m, 2H), 1.52 (s, 9H).

b) 4-(5-(Trifluoromethyl)pyridin-2-yl)-1-(9-methyl-2,3,4,5-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

tert-Butyl 9-methyl-7-(2-oxo-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-1 (2H)-yl)-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (168 mg, 0.321 mmol) was deprotected and converted to the hydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound as an orange solid (73 mg, 54%): mp 305-315° C.; ¹H NMR (500 MHz, CD₃OD) δ 9.05 (s, 1H), 8.28 (dd, J=8.3, 2.2 Hz, 1H), 8.22 (d, J=8.3, Hz, 1H), 7.84 (d, J=7.1 Hz, 1H), 7.67 (d, J=8.4 Hz, 1H), 7.58 (d, J=1.8 Hz, 1H), 7.40 (d, J=1.8 Hz, 1H), 7.25 (dd, J=7.2, 2.0 Hz, 1H), 7.15 (dd, J=8.4, 1.8 Hz, 1H), 4.57 (s, 2H), 3.74 (s, 3H), 3.62 (t, J=6.1 Hz, 2H), 3.15 (t, J=5.9 Hz, 2H); ESI MS m/z 425 [M+H]⁺; HPLC (Method A) 96.4% (AUC), t_(R)=12.6 min.

Example 82 Preparation of 1-(2,9-Dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(5-(trifluoromethyl) pyridin-2-yl)pyridin-2(1H)-one hydrochloride

4-(5-(Trifluoromethyl)pyridin-2-yl)-1-(9-methyl-2,3,4,5-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one (125 mg, 0.294 mmol) was reacted following the procedure of Example 47 to provide the title compound (97.9 g, 78%) as a yellow solid: mp 280-290° C.; ¹H NMR (500 MHz, CD₃OD) δ 9.05 (s, 1H), 8.28 (dd, J=8.3, 2.1 Hz, 1H) 8.22 (d, J=8.4, Hz, 1H), 7.84 (d, J=7.1 Hz, 1H), 7.68 (d, J=8.3 Hz, 1H), 7.59 (d, J=1.6, 1H), 7.40 (d, J=1.7 Hz, 1H), 7.25 (dd, J=7.2, 1.9 Hz, 1H), 7.16 (dd, J=8.3, 1.8 Hz, 1H), 4.87 (s, 1H), 4.51 (s, 1H), 3.87 (s, 1H), 3.75 (br s, 3H), 3.55 (br s, 1H), 3.21-3.17 (m, 5H); ESI MS m/z 439 [M+H]⁺; HPLC (Method B) 98.3% (AUC), t_(R)=12.8 min.

Example 84 Preparation of 4-((5-Fluoropyridin-2-yl)methoxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) tert-Butyl 7-(4-((5-fluoropyridin-2-yl)methoxy)-2-oxopyridin-1(2H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

tert-Butyl 7-bromo-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (306 mg, 0.840 mmol) and 4-(4-fluorobenzyloxy)pyridin-2(1H)-one (142 mg, 0.640 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (157 mg, 49%) as a yellow/green solid: ¹H NMR (300 MHz, CDCl₃) δ 8.49 (d, J=2.0 Hz, 1H), 7.54-7.46 (m, 3H), 7.34-7.28 (m, 2H), 7.01 (dd, J=8.2, 1.8 Hz, 1H), 6.10 (d, J=2.7 Hz, 1H), 6.07 (s, 1H), 5.17 (s, 2H), 4.63 (br m, 2H), 3.74 (br m, 2H), 3.62 (s, 3H), 2.80 (br m, 2H), 1.51 (s, 9H).

b) 4-((5-Fluoropyridin-2-yl)methoxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

tert-Butyl 7-(4-((5-fluoropyridin-2-yl)methoxy)-2-oxopyridin-1(2H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (157 mg, 0.312 mmol) was deprotected and converted to the hydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound as a yellow solid (72.7 mg, 54%): mp 285-295° C.; ¹H NMR (500 MHz, CD₃OD) δ 8.51 (s, 1H), 7.72-7.59 (m, 4H), 7.46 (d, J=1.0 Hz, 1H), 7.05 (dd, J=8.3, 1.5 Hz, 1H), 6.32 (dd, J=7.6, 2.6 Hz, 1H), 7.05 (d, J=2.6 Hz, 1H), 5.26 (s, 2H), 4.54 (s, 2H), 3.71 (s, 3H), 3.60 (t, J=6.0 Hz, 2H), 3.12 (t, J=5.8 Hz, 2H); ESI MS m/z 405 [M+H]⁺; HPLC (Method B) 98.3% (AUC), t_(R)=12.0 min.

Example 85 Preparation of 1-(2,9-Dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-((5-fluoropyridin-2-yl)methoxy)pyridin-2(1H)-one hydrochloride

4-((5-Fluoropyridin-2-yl)methoxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one (76 mg, 0.19 mmol) was reacted following the procedure of Example 47 to provide the title compound (61 mg, 79%) as a yellow solid: mp 287-300° C.; ¹H NMR (500 MHz, CD₃OD) δ 8.51 (d, J=2.6 Hz, 1H), 7.72-7.59 (m, 4H), 7.47 (s, 1H), 7.06 (dd, J=8.3, 1.7 Hz, 1H), 6.32 (dd, J=7.6, 2.6 Hz, 1H), 6.13 (d, J=2.6 Hz, 1H), 5.26 (s, 2H), 4.68 (m, 2H), 3.71 (m, 5H), 3.18 (t, J=5.9 Hz, 2H), 3.15 (s, 3H); ESI MS m/z 419 [M+H]⁺; HPLC (Method B) 98.4% (AUC), t_(R)=11.1 min.

Example 86 Preparation of 1-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(6-(trifluoromethyl)pyridin-3-yl)pyridin-2(1H)-one hydrochloride a) tert-Butyl 9-methyl-7-(2-oxo-4-(6-(trifluoromethyl)pyridin-3-yl)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

4-(6-(Trifluoromethyl)pyridin-3-yl)pyridin-2(1H)-one (145 mg, 0.604 mmol) and tert-butyl 7-bromo-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (200 mg, 0.549 mmol) were coupled following the procedure of Example 30 (step g) to provide the title compound (129 mg, 45%) as a yellow/green solid: ¹H NMR (500 MHz, CDCl₃) δ 9.00 (s, 1H), 8.10 (dd, J=8.1, 2.0 Hz, 1H), 7.82 (d, J=8.2 Hz, 1H), 7.60-7.57 (m, 2H), 7.36 (s, 1H), 7.08 (dd, J=8.3, 1.8 Hz, 1H), 6.93 (d, J=1.8 Hz, 1H), 6.49 (dd, J=7.1, 2.0 Hz, 1H), 4.66 (br m, 2H), 3.76 (br m, 2H), 3.66 (s, 3H), 2.82 (br m, 2H), 1.52 (s, 9H).

b) 1-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(6-(trifluoromethyl)pyridin-3-yl)pyridin-2(1H)-one hydrochloride

tert-Butyl 9-methyl-7-(2-oxo-4-(6-(trifluoromethyl)pyridin-3-yl)pyridin-1 (2H)-yl)-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (129 mg, 0.25 mmol) was deprotected and converted to the hydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (67 mg, 58%) as a yellow/brown solid: mp 315-320° C.; ¹H NMR (500 MHz, CD₃OD) δ 9.10 (d, J=1.9 Hz, 1H), 8.41 (dd, J=8.2, 2.2 Hz, 1H), 7.97 (d, J=8.3 Hz, 1H), 7.85 (d, J=7.0 Hz, 1H), 7.68 (d, J=8.3 Hz, 1H), 7.57 (d, J=1.7 Hz, 1H), 7.15 (dd, J=8.3, 1.8 Hz, 1H), 7.03 (d, J=1.8 Hz, 1H), 6.89 (dd, J=7.1, 2.0 Hz, 1H), 4.57 (br m, 2H), 3.75 (s, 3H), 3.62 (br m, 2H), 3.15 (br m, 2H); ESI MS m/z 425 [M+H]⁺; HPLC (Method B) 97.4% (AUC), t_(R)=12.3 min.

Example 87 Preparation of 1-(2,3,4,9-Tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one hydrochloride a) tert-Butyl 7-bromo-9-tosyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

6N NaOH solution (6 mL), (Bu₄N)₂SO₄ (50% wt. solution in H₂O, 0.20 mL), and TsCl (646 mg, 3.39 mmol) were added to a suspension of tert-butyl 7-bromo-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (991 mg, 2.82 mmol) in toluene (20 mL) and the resulting suspension was stirred at 25° C. for 1.5 h. H₂O and EtOAc were added to the suspension and the phases were separated. The organic phase was washed with H₂O, dried over Na₂SO₄ and concentrated under reduced pressure to afford the title compound (1.285 g, 90%) as a white foam: ¹H NMR (300 MHz, CDCl₃) δ 8.32 (d, J=1.5 Hz, 1H), 7.78-7.66 (m, 2H), 7.36 (dd, J=8.4, 1.5 Hz, 1H), 7.25-7.21 (m, 2H), 7.21-7.13 (m, 1H), 4.92-4.81 (m, 2H), 3.74-3.63 (m, 2H), 2.70-2.61 (m, 2H), 2.37 (s, 3H), 1.50 (s, 9H).

b) tert-Butyl 7-(2-oxo-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-1(2H)-yl)-9-tosyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

4-(5-(Trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one (200 mg, 0.830 mmol) and tert-butyl 7-bromo-9-tosyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (419 mg, 0.830 mmol) were coupled following the procedure of Example 30 (step g) to provide the title compound (222 mg, 40%) as a yellow solid: ¹H NMR (500 MHz, CDCl₃) δ 9.02 (s, 1H), 8.26 (s, 1H), 8.08 (d, J=7.6 Hz, 1H), 7.80 (br s, 2H), 7.57 (d, J=7.2 Hz, 1H), 7.47 (d, J=7.2 Hz, 1H), 7.47 (d, J=8.0 Hz, 1H), 7.32 (d, J=7.9 Hz, 1H), 7.27 (3H, under solvent peak), 7.07 (d, J=6.8 Hz, 1H), 4.91 (br m, 2H), 3.71 (br m, 2H), 2.71 (br m, 2H), 2.36 (s, 3H), 1.52 (s, 9H).

c) 1-(9-Tosyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one

tert-Butyl 7-(2-oxo-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-1(2H)-yl)-9-tosyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (222 mg, 0.334 mmol) was deprotected according to the procedure of Example 30 (step e) to provide the title compound (131 mg, 58%) as a yellow solid: ¹H NMR (300 MHz, CDCl₃) δ 9.02 (s, 1H), 8.25 (d, J=1.6 Hz, 1H), 8.08 (dd, J=8.3, 1.9 Hz, 1H), 7.93 (d, J=8.3 Hz, 1H), 7.75 (d, J=8.4 Hz, 2H), 7.58 (d, J=7.2 Hz, 1H), 7.48 (d, J=8.3 Hz, 1H), 7.32 (dd, J=8.3, 1.8 Hz, 1H), 7.28-7.24 (3H, under solvent peak), 7.08 (dd, J=7.2, 2.0 Hz, 1H), 4.30 (br s, 2H), 3.13 (t, J=5.6 Hz, 2H), 3.61 (br m, 2H), 2.36 (s, 3H).

d) 1-(2,3,4,9-Tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one dihydrochloride

1-(9-Tosyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(5-(trifluoromethyl)pyridin-2-yl)pyri din-2(1H)-one (130 mg, 0.23 mmol) was deprotected according to the procedure of Example 106 (step b) to provide the title compound (39.5 mg, 36%) as a yellow solid: mp 320-330° C.; ¹H NMR (500 MHz, CD₃OD) δ 9.05 (s, 1H), 8.28 (dd, J=8.4, 2.1 Hz, 1H), 8.22 (d, J=8.4 Hz, 1H), 7.82 (d, J=7.2 Hz, 1H), 7.66 (d, J=8.4 Hz, 1H), 7.48 (d, J=7.1 Hz, 1H), 7.39 (d, J=1.7 Hz, 1H), 7.24 (dd, J=7.2, 1.9 Hz, 1H), 7.13 (dd, J=8.4, 1.8 Hz, 1H), 4.50 (s, 2H), 3.63 (t, J=6.1 Hz, 2H), 3.14 (t, J=6.1 Hz, 2H); ESI MS m/z 411 [M+H]⁺; HPLC (Method B) 98.4% (AUC), t_(R)=12.6 min.

Example 88 Preparation of 5-(Benzyloxy)-2-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridazin-3(2H)-one hydrochloride a) tert-Butyl 7-(4-(benzyloxy)-6-oxopyridazin-1(6H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

5-(Benzyloxy)pyridazin-3(2H)-one (197 mg, 0.974 mmol) and tert-butyl 7-bromo-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (353 mg, 0.966 mmol) were coupled following the procedure of Example 30 (step g) to provide the title compound (130 mg, 28%) as a yellow/green solid: ¹H NMR (300 MHz, CDCl₃) δ 7.77 (d, J=2.7 Hz, 1H), 7.52 (d, J=8.2 Hz, 1H), 7.45-7.40 (m, 7H), 7.21 (dd, J=8.4, 1.5 Hz, 1H), 5.08 (s, 2H), 4.64 (br m, 2H), 3.75 (br m, 2H), 3.63 (s, 3H), 2.80 (br m, 2H), 1.52 (s, 9H).

b) 5-(Benzyloxy)-2-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridazin-3(2H)-one hydrochloride

tert-Butyl 7-(4-(benzyloxy)-6-oxopyridazin-1 (6H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (130 mg, 0.27 mmol) was deprotected and converted to the hydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (55.7, 48%) as a yellow solid: mp 235-245° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.93 (d, J=2.7 Hz, 1H), 7.59 (d, J=8.4 Hz, 1H), 7.56 (d, J=1.5 Hz, 1H), 7.50-7.48 (m, 2H), 7.43 (overlapping dd, J=7.8 Hz, 2H), 7.39 (d, J=1.7 Hz, 1H), 7.18 (dd, J=8.4, 1.7 Hz, 1H), 6.48 (d, J=2.7 Hz, 1H), 5.22 (s, 2H), 4.54 (s, 2H), 3.71 (s, 3H), 3.59 (t, J=5.6 Hz, 2H), 3.12 (t, J=5.9 Hz, 2H); ESI MS m/z 387 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=11.7 min.

Example 89 Preparation of 1-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-((6-(trifluoromethyl)pyridin-3-yl)methoxy)pyridin-2(1H)-one hydrochloride a) tert-Butyl 9-methyl-7-(2-oxo-4-((6-(trifluoromethyl)pyridin-3-yl)methoxy)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

4-((6-(Trifluoromethyl)pyridin-3-yl)methoxy)pyridin-2(1H)-one (100 mg, 0.37 mmol) and tert-butyl 7-bromo-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (135 mg, 0.370 mmol) were coupled following the procedure of Example 30 (step g) to provide the title compound (44 mg, 21%) as a yellow/brown solid: ¹H NMR (300 MHz, CDCl₃) δ 8.81 (s, 1H), 7.96 (d, J=8.6 Hz, 1H), 7.75 (d, J=8.0 Hz, 1H), 7.54 (d, J=8.3 Hz, 1H), 7.37-7.34 (m, 1H), 7.27 (1H, under solvent peak), 7.02 (dd, J=8.3, 1.7 Hz, 1H), 6.07-6.04 (m, 2H), 5.16 (s, 2H), 4.64 (br m, 2H), 3.75 (br m, 2H), 3.63 (s, 3H), 2.80 (br m, 2H), 1.52 (s, 9H).

b) 1-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-((6-(trifluoromethyl)pyridin-3-yl)methoxy)pyridin-2(1H)-one hydrochloride

tert-Butyl 9-methyl-7-(2-oxo-4-((6-(trifluoromethyl)pyridin-3-yl)methoxy)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (44 mg, 0.079 mmol) was deprotected and converted to the hydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (28 mg, 65%) as a yellow solid: mp 285-295° C.; ¹H NMR (500 MHz, CD₃OD) δ 8.75 (s, 1H), 8.08 (d, J=7.9 Hz, 1H), 7.79 (d, J=8.1 Hz, 1H), 7.53 (dd, J=7.9, 2.0 Hz, 2H), 7.38 (d, J=1.7 Hz, 1H), 6.97 (dd, J=8.4, 1.8 Hz, 1H), 6.25 (dd, J=7.6, 2.7 Hz, 1H), 6.08 (d, J=2.6 Hz, 1H), 5.26 (s, 2H), 4.46 (s, 2H), 3.63 (s, 3H), 3.51 (t, J=6.1 Hz, 2H), 3.03 (t, J=6.1 Hz, 2H); ESI MS m/z 455 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=12.8 min.

Example 90 Preparation of 1-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(5-methylpyridin-2-yl)pyridin-2(1H)-one dihydrochloride a) 2′-Methoxy-5-methyl-2,4′-bipyridine

2-Bromo-5-methylpyridine (2.93 g, 17.0 mmol) and 2-methoxy-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine (3.34 g, 14.2 mmol) were reacted according to Example 31 (step a) to provide the title compound (1.2 g, 42%) as a brown solid: ESI MS m/z 201 [M+H]⁺.

b) 4-(5-Methylpyridin-2-yl)pyridin-2(1H)-one

2′-Methoxy-5-methyl-2,4′-bipyridine (1.2 g, 6.0 mmol) was reacted according to Example 31 (step c) to provide the title compound (301 mg, 27%) as a white solid: ¹H NMR (500 MHz, DMSO-d₆) δ 11.58 (s, 1H) 8.53 (s, 1H), 7.88 (overlapping dd, J=8.2 Hz, 1H), 7.71 (d, J=6.0 Hz, 1H), 7.43 (d, J=7.7, 1H), 6.95 (d, J=1.5 Hz, 1H), 6.84 (dd, J=6.9, 1.7 Hz, 1H), 2.34 (s, 3H).

c) tert-Butyl 9-methyl-7-(4-(5-methylpyridin-2-yl)-2-oxopyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

4-(5-methylpyridin-2-yl)pyridin-2(1H)-one (150 mg, 0.81 mmol) and tert-butyl 7-bromo-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (294 mg, 0.805 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (138 mg, 36%) as a yellow/green solid: ¹H NMR (500 MHz, CDCl₃) δ 8.56 (s, 1H), 7.71 (d, J=8.2 Hz, 1H), 7.63-7.61 (m, 1H), 7.56 (d, J=8.3 Hz, 1H), 7.52 (d, J=7.2 Hz, 1H), 7.37 (s, 1H), 7.17 (d, J=1.6 Hz, 1H), 7.09 (dd, J=8.3, 1.7 Hz, 1H), 7.04 (dd, J=7.2, 1.9 Hz, 1H), 4.65 (br m, 2H), 3.76 (br m, 2H), 3.65 (s, 3H), 2.82 (br m, 2H), 2.42 (s, 3H), 1.51 (s, 9H).

d) 1-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(5-methylpyridin-2-yl)pyridin-2(1H)-one dihydrochloride

tert-Butyl 9-methyl-7-(4-(5-methylpyridin-2-yl)-2-oxopyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (138 mg, 0.27 mmol) was deprotected and converted to the dihydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (18 mg, 15%) as a yellow solid: mp 303-310° C.; ¹H NMR (500 MHz, CD₃OD) δ 8.59 (s, 1H), 7.95 (d, J=8.1 Hz, 1H), 7.87 (d, J=6.5 Hz, 1H), 7.80 (d, J=7.0 Hz, 1H), 7.67 (d, J=8.4 Hz, 1H), 7.56 (d, J=1.4 Hz, 1H), 7.24 (d, J=1.6 Hz, 1H), 7.15-7.12 (m, 2H), 4.57 (s, 2H), 3.74 (s, 3H), 3.61 (t, J=6.0 Hz, 2H), 3.14 (t, J=6.1 Hz, 2H), 2.46 (s, 3H); ESI MS m/z 371 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=11.0 min.

Example 91 Preparation of 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(5-methylpyridin-2-yl)pyridin-2(1H)-one dihydrochloride a) tert-Butyl 5-methyl-7-(4-(5-methylpyridin-2-yl)-2-oxopyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

4-(5-Methylpyridin-2-yl)pyridin-2(1H)-one (150 mg, 0.81 mmol) and tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (294 mg, 0.805 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (245 mg, 64%) as a yellow/green solid: ¹H NMR (300 MHz, CDCl₃) δ 8.57 (d, J=2.0 Hz, 1H), 7.71 (d, J=8.0 Hz, 1H), 7.64-7.60 (m, 1H), 7.55-7.51 (m, 2H), 7.37 (d, J=1.6 Hz, 1H), 7.17 (d, J=1.6 Hz, 1H), 7.10-7.03 (m, 2H), 4.66 (br m, 2H), 3.85 (br m, 2H), 3.65 (s, 3H), 2.84 (br m, 2H), 2.42 (s, 3H), 1.51 (s, 9H).

b) 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(5-methylpyridin-2-yl)pyridin-2(1H)-one dihydrochloride

tert-Butyl 5-methyl-7-(4-(5-methylpyridin-2-yl)-2-oxopyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (245 mg, 0.520 mmol) was deprotected and converted to the dihydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (57 mg, 30%) as a yellow solid: mp 295-305° C.; ¹H NMR (500 MHz, CD₃OD) δ 8.76 (d, J=1.8 Hz, 1H), 8.34 (d, J=6.9 Hz, 1H), 8.24 (d, J=8.2 Hz, 1H), 7.94 (d, J=7.2 Hz, 1H), 7.67 (d, J=8.3 Hz, 1H), 7.61 (d, J=1.7 Hz, 1H), 7.23 (d, J=1.8 Hz, 1H), 7.17 (dd, J=8.3, 1.8 Hz, 1H), 7.04 (dd, J=7.1, 2.1 Hz, 1H), 4.53 (s, 2H), 3.79 (s, 3H), 3.71 (t, J=6.2 Hz, 2H), 3.25 (t, J=6.2 Hz, 2H), 2.61 (s, 3H); ESI MS m/z 371 [M+H]⁺; HPLC (Method B) 97.3% (AUC), t_(R)=10.9 min.

Example 92 Preparation of 1-(5-Methyl-2,3,4,9-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(6-methylpyridin-3-yl)pyridin-2(1H)-one dihydrochloride a) 2′-Methoxy-6-methyl-3,4′-bipyridine

2-Methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine (3.5 g, 16 mmol) and 4-bromo-2-methoxypyridine (2.0 g, 11 mmol) were reacted according to Example 31 (step a) to provide the title compound (2.1 g, 98%) as a brown solid: ¹H NMR (300 MHz, CDCl₃) δ 8.75 (d, J=2.1 Hz, 1H), 8.23 (d, J=5.4 Hz, 1H), 7.78 (dd, J=8.0, 2.4 Hz, 1H), 7.24 (d, J=8.1, 1H), 7.08 (dd, J=5.4, 1.5 Hz, 1H), 6.84 (d, J=1.0, 1H), 3.98 (s, 3H), 2.61 (s, 3H).

b) 4-(6-Methylpyridin-3-yl)pyridin-2(1H)-one

2′-Methoxy-6-methyl-3,4′-bipyridine (2.1 g, 10.4 mmol) was reacted according to Example 31 (step c) to provide the title compound (1.36 mg, 68%) as a white solid: ¹H NMR (300 MHz, DMSO-d₆) δ 11.65 (s, 1H) 8.78 (d, J=2.1 Hz, 1H), 8.01 (dd, J=8.1, 2.5 Hz, 1H), 7.47 (d, J=6.9 Hz, 1H), 7.36 (d, J=8.1, 1H), 6.66 (d, J=1.4 Hz, 1H), 6.55 (dd, J=6.9, 1.8 Hz, 1H), 2.51 (s, 3H).

c) tert-Butyl 5-methyl-7-(4-(6-methylpyridin-3-yl)-2-oxopyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

4-(6-Methylpyridin-3-yl)pyridin-2(1H)-one (150 mg, 0.81 mmol) and tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (294 mg, 0.805 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (220 mg, 58%) as a yellow/green solid: ¹H NMR (500 MHz, CDCl₃) δ 8.79 (d, J=8.2 Hz, 1H), 7.83 (dd, J=8.1, 2.4 Hz, 1H), 7.56-7.51 (m, 2H), 7.37 (d, J=1.4 Hz, 1H), 7.30 (1H, partially under solvent), 7.08 (d, J=8.7 Hz, 1H), 6.90 (d, J=1.6 Hz, 1H), 6.50 (dd, J=7.1, 1.9 Hz, 1H), 4.66 (br s, 2H), 3.85 (br m, 2H), 3.65 (s, 3H), 2.84 (br m, 2H), 2.64 (s, 3H), 1.51 (s, 9H).

d) 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(6-methylpyridin-3-yl)pyridin-2(1H)-one dihydrochloride

tert-Butyl 5-methyl-7-(4-(6-methylpyridin-3-yl)-2-oxopyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (220 mg, 0.47 mmol) was deprotected and converted to the dihydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (50.2 mg, 29%) as a yellow solid: mp 295-305° C.; ¹H NMR (500 MHz, CD₃OD) δ 8.80 (d, J=2.2 Hz, 1H), 8.12 (dd, J=8.1, 2.5 Hz, 1H), 7.79 (d, J=7.0 Hz, 1H), 7.59 (d, J=8.3 Hz, 1H), 7.52 (d, J=1.7 Hz, 1H), 7.47 (d, J=8.2 Hz, 1H), 7.10 (dd, J=8.3, 1.9 Hz, 1H), 6.93 (d, J=1.8 Hz, 1H), 6.85 (dd, J=7.1, 2.0 Hz, 1H), 4.34 (s, 2H), 3.73 (s, 3H), 3.52 (t, J=6.1 Hz, 2H), 3.10 (t, J=6.1 Hz, 2H), 2.62 (s, 3H); ESI MS m/z 371 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=8.7 min.

Example 93 Preparation of 1-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(6-methylpyridin-3-yl)pyridin-2(1H)-one dihydrochloride a) tert-Butyl 9-methyl-7-(4-(6-methylpyridin-3-yl)-2-oxopyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

4-(6-Methylpyridin-3-yl)pyridin-2(1H)-one (150 mg, 0.81 mmol) and tert-butyl 7-bromo-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (294 mg, 0.805 mmol) were reacted following the procedure of Example 30 (step g) to provide the title compound (208 mg, 55%) as a yellow/green solid: ¹H NMR (300 MHz, CDCl₃) δ 8.79 (d, J=8.2 Hz, 1H), 7.83 (dd, J=8.0, 2.3 Hz, 1H), 7.58-7.51 (m, 2H), 7.36 (s, 1H), 7.30 (1H, partially under solvent), 7.08 (dd, J=8.3, 1.8 Hz, 1H), 6.90 (d, J=1.7 Hz, 1H), 6.50 (dd, J=7.1, 2.0 Hz, 1H), 4.65 (br s, 2H), 3.76 (br m, 2H), 3.65 (s, 3H), 2.82 (br m, 2H), 2.64 (s, 3H), 1.52 (s, 9H).

b) 1-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(6-methylpyridin-3-yl)pyridin-2(1H)-one dihydrochloride

tert-Butyl 9-methyl-7-(4-(6-methylpyridin-3-yl)-2-oxopyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (208 mg, 0.442 mmol) was deprotected and converted to the dihydrochloride salt according to the procedure of Example 30 (steps e and g) to provide the title compound (40.6 mg, 23%) as a yellow solid: mp 305-313° C.; ¹H NMR (500 MHz, CD₃OD) δ 8.80 (d, J=8.1 Hz, 1H), 8.11 (dd, J=8.2, 2.5 Hz, 1H), 7.79 (d, J=7.0 Hz, 1H), 7.64 (d, J=8.3 Hz, 1H), 7.52 (d, J=1.7 Hz, 1H), 7.47 (d, J=8.2 Hz, 1H), 7.11 (dd, J=8.3, 1.8 Hz, 1H), 6.93 (d, J=1.9 Hz, 1H), 6.85 (dd, J=7.1, 2.0 Hz, 1H), 4.40 (s, 2H), 3.71 (s, 3H), 3.46 (t, J=5.9 Hz, 2H), 3.04 (t, J=5.9 Hz, 2H), 2.62 (s, 3H); ESI MS m/z 371 [M+H]⁺; HPLC (Method B) >99% (AUC), t_(R)=8.9 min.

Example 94 Preparation of 4-(Benzyloxy)-1-(1,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) tert-Butyl 7-bromo-1,9-dimethyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(9H)-carboxylate

To a solution of 2-(6-bromo-1H-indol-3-yl)ethanamine (1.9 g, 8.0 mmol) in THF (30 mL) at 0° C. was added saturated aqueous NaHCO₃ (30 mL) and acetyl chloride (0.56 mL, 7.95 mmol). The reaction was warmed up to room temperature and stirred at room temperature until complete. The solution was concentrated, and the residue was dissolved in CH₂Cl₂, washed with H₂O and brine and dried with Na₂SO₄. The organic solution was filtered and concentrated to give a pale yellow foam. The foam was suspended in benzene (70 mL) and treated with POCl₃ (3.52 mL, 38.4 mmol). The reaction was heated and stirred at 85° C. for one hour. After the solution was concentrated, the residue was purified by flash column chromatography (silica gel, 10% CH₃OH in CH₂Cl₂) to give a brown solid (1.83 g 91%). The solid was suspended in EtOH (20 mL) and CHCl₃ (20 mL) and cooled to 0° C. NaBH₄ (0.26 g, 6.95 mmol) was added, and the reaction was stirred from 0° C. to room temperature for one hour. The reaction was quenched with H₂O, extracted with CH₂Cl₂, washed with H₂O and brine and dried over Na₂SO₄. The organic solution was filtered and concentrated to give a yellow foam (1.44 g, 78%). The foam was dissolved in i-PrOH (15 mL) and H₂O (10 mL) and treated with Boc₂O (1.36 g, 6.24 mmol) and K₂CO₃ (0.86 g, 6.2 mmol). The reaction was stirred at room temperature for one hour and then concentrated under reduced pressure. The resulting residue was dissolved in CH₂Cl₂, washed with H₂O and brine and dried over Na₂SO₄. After filtration and concentration, the residue was purified by flash column chromatography (silica gel, hexanes/EtOAc, 4:1) to give a yellow foam (0.92 g, 46%). The foam was dissolved in DMF (6 mL) and cooled to 0° C. The solution was treated with NaH (60% weight dispersion in mineral oil, 108 mg, 2.68 mmol) followed by CH₃I (0.17 mL, 0.69 mmol). The reaction was stirred at 0° C. until complete. The reaction was quenched with H₂O, extracted with CH₂Cl₂, washed with H₂O and brine and dried over Na₂SO₄. The organic solution was filtered and concentrated, and the residue was purified by flash column chromatography (silica gel, hexanes/EtOAc, 4:1) to give the title compound as a white foam (0.82 g, 89%). ¹H NMR (300 MHz, CDCl₃) δ 7.42 (s, 1H), 7.31 (d, J=8.0 Hz, 1H), 7.18 (d, J=8.0 Hz, 1H), 5.43-5.20 (m, 1H), 4.48-4.26 (m, 1H), 3.62 (s, 3H), 3.24-3.13 (m, 1H), 2.78-2.66 (m, 2H), 1.49 (s, 9H), 1.47 (d, J=6.5 Hz, 3H); MS (ESI) m/z 380 [M+H]⁺.

b) 4-(Benzyloxy)-1-(1,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

To a mixture of tert-butyl 7-bromo-1,9-dimethyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(9H)-carboxylate (0.57 g, 1.6 mmol), 4-(benzyloxy)pyridin-2(1H)-one (0.32 g, 1.6 mmol), 8-hydroxyquilinine (46 mg, 0.32 mmol), K₂CO₃ (0.26 g, 1.9 mmol) and CuI (0.15 g, 0.79 mmol) was added DMSO (4 mL). The reaction mixture was degassed and back-filled with N₂. The reaction was stirred at 130° C. overnight. The mixture was cooled and filtered through a layer of Celite. The filtrate was diluted with CH₂Cl₂, washed with H₂O and 5% aqueous LiCl and dried over Na₂SO₄. The organic solution was filtered and concentrated. The residue was purified by flash column chromatography (silica gel, 5% CH₃OH in CH₂Cl₂) to give a yellow solid (0.5 g, 64%). The solid was dissolved in CH₃OH (8 mL) and treated with 1N HCl in Et₂O (5 mL). The reaction was stirred at room temperature until complete. The solvent was removed under reduced pressure and the resulting solid was dried under vacuum to give the title compound (0.44 g, 100%) as a yellow powder: ¹H NMR (500 MHz, CD₃OD) δ 7.79 (d, J=7.0 Hz, 1H), 7.66 (d, J=8.0 Hz, 1H), 7.53 (s, 1H), 7.48-7.36 (m, 5H), 7.10 (d, J=8.5 Hz, 1H), 6.55 (d, J=6.5 Hz, 1H), 6.33 (s, 1H), 5.27 (s, 2H), 4.98 (q, J=6.5 Hz, 1H), 3.76 (s, 3H), 3.67-3.59 (m, 2H), 3.13-3.08 (m, 2H), 1.76 (d, J=7.0 Hz, 3H); ESI MS m/z 400 [M+H]⁺; HPLC (Method A) >99% (AUC), t_(R)=12.9 min.

Example 95 Preparation of 4-(Benzyloxy)-1-(1,2,9-trimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

To a solution of 4-(benzyloxy)-1-(1,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride (205 mg, 0.470 mmol) in CH₃OH (8 mL) was added formaldehyde (53 μL, 0.71 mmol) and NaBH(OAc)₃ (200 mg, 0.94 mmol). The reaction was stirred at room temperature until complete and then concentrated under reduced pressure. The residue was dissolved in CH₂Cl₂ and washed with H₂O and 5% aqueous LiCl and dried over Na₂SO₄. The organic solution was filtered and concentrated. The residue was purified by flash column chromatography (silica gel, 10% CH₃OH in CH₂Cl₂) to give 4-(benzyloxy)-1-(1,2,9-trimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one as a white solid (0.15 g, 77%). The free base was converted to the HCl salt to give the title compound (147 mg, 90%) as an off-white powder: ¹H NMR (500 MHz, CD₃OD) δ 7.58-7.55 (m, 2H), 7.47-7.34 (m, 6H), 6.99 (d, J=8.5, 1.0 Hz, 1H), 6.28 (dd, J=7.5, 2.5 Hz, 1H), 6.11 (d, J=2.5 Hz, 1H), 5.18 (s, 2H), 4.27 (q, J=6.5 Hz, 1H), 3.69 (s, 3H), 3.36-3.33 (m, 1H), 3.10-2.96 (m, 2H), 2.84-2.80 (m, 1H), 2.65 (s, 3H), 1.51 (d, J=6.5 Hz, 3H); ESI MS m/z 414 [M+H]⁺; HPLC (Method A) >99% (AUC), t_(R)=13.0 min.

Example 96 Preparation of 4-(Benzyloxy)-1-(5-(ethoxymethyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) tert-Butyl 7-(4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-5-(ethoxymethyl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

To a solution of tert-butyl 7-bromo-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (0.66 g, 1.9 mmol) in DMF (8 mL) was added NaH (60% weight dispersion in mineral oil, 113 mg, 2.82 mmol) followed by SEMCl (0.50 mL, 2.8 mmol). The reaction was stirred at room temperature until complete. The reaction was quenched with H₂O, and the aqueous mixture was extracted with CH₂Cl₂. The organic phase was washed with H₂O and brine and dried over Na₂SO₄. After filtration and concentration, the residue was dried under vacuum to give tert-butyl 7-bromo-5-((2-(trimethylsilyl)ethoxy)methyl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate, which and used directly in the next step. To a mixture of tert-butyl 7-bromo-5-((2-(trimethylsilyl)ethoxy)methyl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (0.75 g, 1.6 mmol), 4-benzyloxypyridone (0.31 g, 1.6 mmol), 8-hydroxyquilinine (34 mg, 0.23 mmol), K₂CO₃ (0.26 g, 1.9 mmol) and CuI (45 mg, 0.23 mmol) was added DMSO (6 mL). The reaction mixture was degassed and back-filled with N₂. The reaction was stirred at 130° C. overnight. The mixture was cooled and filtered through a layer of Celite. The filtrate was diluted with CH₂Cl₂, washed with H₂O and 5% aqueous LiCl and dried over Na₂SO₄. The organic solution was filtered and concentrated, and the residue was purified by flash column chromatography (silica gel, 5% CH₃OH in CH₂Cl₂) to give the title compound as a yellow oil (0.12 g, 13%): ¹H NMR (500 MHz, CDCl₃) δ 7.60 (d, J=8.5 Hz, 1H), 7.44-7.37 (m, 6H), 7.31 (d, J=7.5 Hz, 1H), 7.09 (m, 1H), 6.12 (s, 1H), 6.07 (d, J=6.5 Hz, 1H), 5.40 (s, 2H), 5.07 (s, 2H), 4.65 (m, 2H), 3.86 (m, 2H), 3.51 (t, J=8.0 Hz, 2H), 2.73 (m, 2H), 1.53 (s, 9H), 0.89 (t, J=8.0 Hz, 2H), −0.04 (s, 9H); ESI MS m/z 602 [M+H]⁺.

b) 4-(Benzyloxy)-1-(5-(ethoxymethyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

To a solution of tert-butyl 7-(4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-5-(ethoxymethyl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (120 mg, 0.20 mmol) in EtOH (2 mL) was added 1N HCl in Et₂O (1 mL). The reaction was stirred at 60° C. until complete. The solvent was concentrated and the residue was purified by preparative HPLC (Phenomenex Luna C18 (2), 250×50 mm, 15 micron, H₂O with 0.05% TFA and CH₃CN with 0.05% TFA) to give 4-(benzyloxy)-1-(5-(ethoxymethyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one as a white solid (54 mg, 73%). The free base was converted to the HCl salt to give the title compound (35 mg, 65%) as a white powder: mp 148-149° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 9.12 (s, 2H), 7.66 (d, J=2.0 Hz, 1H), 7.59-7.56 (m, 2H), 7.49-7.37 (m, 5H), 7.08-7.05 (m, 1H), 6.14-6.12 (m, 1H), 5.99 (d, J=2.5 Hz, 1H), 5.57 (s, 2H), 5.17 (s, 2H), 4.38 (m, 2H), 3.55 (m, 2H), 3.45-3.40 (m, 2H), 3.13 (m, 2H), 1.08-1.05 (m, 3H); ESI MS m/z 430 [M+H]⁺; HPLC (Method A) >99% (AUC), t_(R)=12.8 min.

Example 97 Preparation of 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-phenylpyridin-2(1H)-one hydrochloride a) tert-Butyl 5-methyl-7-(2-oxo-4-(trifluoromethylsulfonyloxy)pyridine-1(2H)-yl)3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

To a solution of tert-butyl 7-(4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (0.98 g, 2.0 mmol) in CH₃OH (30 mL) was added 5% Pd/C (0.3 g) and ammonium formate (0.32 g, 5.1 mmol) under an atmosphere of argon. The reaction was stirred at 90° C. until complete. The reaction mixture was cooled and filtered through a layer of Celite. The solvent was removed under reduced pressure to give tert-butyl 7-(4-hydroxy-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate, which was used directly in the next step. To a solution of tert-butyl 7-(4-hydroxy-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (800 mg, 2.02 mmol) in THF (10 mL) was added LiN(SiMe₃)₂(1.0M in THF, 2.6 mL, 2.6 mmol) followed by PhN(Tf)₂ (0.94 g, 2.6 mmol) under an atmosphere of argon. The reaction was stirred at room temperature until complete. The solvent was removed under reduced pressure, and the residue was purified by flash column chromatography (silica gel, hexanes/EtOAc, 1:1) to give the title compound (0.42 g, 40% yield) as a white solid: ¹H NMR (300 MHz, CDCl₃) δ 7.57-7.53 (m, 2H), 7.30 (d, J=1.5 Hz, 1H), 7.02-6.99 (m, 1H), 6.60 (d, J=2.7 Hz, 1H), 6.27 (dd, J=7.8, 2.7 Hz, 1H), 4.65 (s, 2H), 3.85 (m, 2H), 3.65 (s, 3H), 2.84 (m, 2H), 1.51 (s, 9H); ESI MS m/z 528 [M+H]⁺.

b) 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-phenylpyridin-2(1H)-one hydrochloride

Following the procedure of Example 25 (step b), but substituting phenylboronic acid for 4-fluorophenylboronic acid and eliminating the methylation step, the title compound (37 mg, 46%) was obtained as a yellow solid: mp 275-280° C. (decompose); ¹H NMR (500 MHz, DMSO-d₆) δ 9.26 (s, 2H), 7.79 (dd, J=8.0, 1.5 Hz, 2H), 7.75 (d, J=7.5 Hz, 1H), 7.62 (d, J=1.5 Hz, 1H), 7.59 (d, J=8.5 Hz, 1H), 7.55-7.50 (m, 3H), 7.10 (dd, J=8.5, 2.0 Hz, 1H), 6.78 (d, J=1.5 Hz, 1H), 6.70 (dd, J=7.0, 2.0 Hz, 1H), 4.37 (m, 2H), 3.71 (s, 3H), 3.54-3.53 (m, 2H), 3.10 (t, J=6.0 Hz, 2H); ESI MS m/z 356 [M+H]⁺; HPLC (Method A) >99% (AUC), t_(R)=12.3 min.

Example 98 Preparation of 1-(2,5-Dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-phenylpyridin-2(1H)-one hydrochloride

Following the procedure of Example 25 (step b), but substituting phenylboronic acid for 4-fluorophenylboronic acid, the title compound (56 mg, 83%) was obtained as an off-white solid: mp 290-295° C. (decompose); ¹H NMR (500 MHz, DMSO-d₆) δ 10.46 (s, 1H), 7.80-7.74 (m, 3H), 7.63 (s, 1H), 7.56-7.52 (m, 4H), 7.11 (d, J=8.0 Hz, 1H), 6.78 (s, 1H), 6.70 (d, J=7.0 Hz, 1H), 4.68-4.65 (m, 1H), 4.34-4.30 (m, 1H), 3.82-3.79 (m, 1H), 3.71 (s, 3H), 3.53-3.51 (m, 1H), 3.20 (m, 2H), 3.00 (d, J=4.0 Hz, 3H); ESI MS m/z 370 [M+H]⁺; HPLC (Method A) 98% (AUC), t_(R)=12.5 min.

Example 99 Preparation of 4-(2-Fluoro-4-methoxyphenyl)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

Following the procedure of Example 25 (step b), but substituting 2-fluoro-4-methoxyphenylboronic acid for 4-fluorophenylboronic acid and eliminating the methylation step, the title compound (34 mg, 19%) was obtained as a green powder: mp 270-274° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.72 (d, J=7.0 Hz, 1H), 7.63-7.56 (m, 3H), 7.14 (dd, J=8.5, 1.5 Hz, 1H), 6.92 (dd, J=8.5, 2.5 Hz, 1H), 6.87 (dd, J=13.0, 2.5 Hz, 1H), 6.84 (s, 1H), 6.77-6.75 (m, 1H), 4.50 (s, 2H), 3.88 (s, 3H), 3.76 (s, 3H), 3.68 (t, J=6.0 Hz, 2H), 3.22 (t, J=6.0 Hz, 2H); ESI MS m/z 404 [M+H]⁺; HPLC (Method A) >99% (AUC), t_(R)=12.3 min

Example 100 Preparation of 1-(2-Acetyl-5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(benzyloxy)pyridin-2(1H)-one

To a solution of 4-(benzyloxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (0.2 g, 0.5 mmol) in CH₂Cl₂ (6 mL) was added triethylamine (0.20 mL, 1.4 mmol) followed by acetyl chloride (50 μL, 0.71 mmol). The reaction was stirred at room temperature until complete. After the solvent was removed under reduced pressure, the residue was purified by flash column chromatography (silica gel, 5% CH₃OH in CH₂Cl₂) to give the title compound (72.2 mg, 36%) as a yellow solid and as a mixture of rotamers: mp 225-230° C.; ¹H NMR (500 MHz, CDCl₃) δ 7.53-7.36 (m, 6H), 7.32-7.30 (m, 2H), 7.06-7.00 (m, 1H), 6.09 (d, J=3.0 Hz, 1H), 6.07-6.04 (m, 1H), 5.06 (s, 2H), 4.82 (s, 1H), 4.67 (s, 1H), 4.03 (t, J=5.5 Hz, 1H), 3.84 (t, J=5.5 Hz, 1H), 3.64 (s, 3H), 2.90 (t, J=5.5 Hz, 1H), 2.84 (t, J=5.5 Hz, 1H), 2.24, 2.22 (2×s, 3H); ESI MS m/z 428 [M+H]⁺; HPLC (Method A) 95.7% (AUC), t_(R)=16.8 min.

Example 101 Preparation of 1-(2-Acetyl-5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-((5-fluoropyridin-2-yl)methoxy)pyridin-2(1H)-one

Following the procedure of Example 100, but substituting 4-((5-fluoropyridin-2-yl)methoxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-pyridin-2(1H)-one for 4-(benzyloxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one, the title compound (71 mg, 61%) was obtained as a yellow solid and as a mixture of rotamers: mp 220-224° C.; ¹H NMR (500 MHz, CDCl₃) δ 8.50 (d, J=1.5 Hz, 1H), 7.54-7.46 (m, 3H), 7.35 (d, J=7.5 Hz, 1H), 7.32 (d, J=2.0 Hz, 1H), 7.03 (ddd, J=20, 8.0, 1.5 Hz, 1H), 6.15-6.08 (m, 2H), 5.18 (s, 2H), 4.83, 4.70 (2×s, 2H), 4.04 (t, J=5.5 Hz, 1H), 3.85 (t, J=5.5 Hz, 1H), 3.65, 3.64 (2×s, 3H), 2.91 (t, J=5.5 Hz, 1H), 2.85 (t, J=5.5 Hz, 1H), 2.23, 2.25 (2×s, 3H); ESI MS m/z 447 [M+H]⁺; HPLC (Method A) 96.4% (AUC), t_(R)=14.5 min.

Example 102 Preparation of 4-(Cyclohexylmethoxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) 4-(Cyclohexylmethoxy)pyridin-2(1H)-one

To a solution of cyclohexylmethanol (1.1 mL, 9.3 mmol) in DMF (8 mL) was added NaH (60% weight dispersion in mineral oil, 0.37 g, 9.3 mmol) in one portion. After the bubbles disappeared, 4-chloropyridine N-oxide (1.0 g, 7.7 mmol) was added. The reaction was stirred at room temperature under Ar until complete. The reaction was quenched with water and the aqueous mixture was extracted with CH₂Cl₂. The combined organic extracts were washed with H₂O and 5% aqueous LiCl and dried over Na₂SO₄. After filtration and concentration, the residue was purified by flash column chromatography (silica gel, 10% CH₃OH in CH₂Cl₂) to give a yellow solid. The yellow solid was suspended in Ac₂O (5 mL) and heated at 140° C. for 4 h. The reaction mixture was cooled, diluted with CH₃OH/H₂O (10 mL, 1:1) and stirred at room temperature for 1 h. The mixture was concentrated, and the residue was purified by flash column chromatography (silica gel, 10% CH₃OH in CH₂Cl₂) to give the title compound (0.92 g, 58%) as a brown solid: ¹H NMR (300 MHz, DMSO-d₆) δ 11.03 (s, 1H), 7.21 (d, J=7.2 Hz, 1H), 5.83 (dd, J=7.2, 2.4 Hz, 1H), 5.64 (d, J=2.4 Hz, 1H), 3.72 (d, J=6.0 Hz, 2H), 1.84-1.68 (m, 6H), 1.30-1.01 (m, 5H).

Following the procedure of Example 1 (steps c and d), but substituting 4-(cyclohexylmethoxy)pyridin-2(1H)-one for 4-benzyloxypyridone, the title compound (56 mg, 81%) was obtained as a yellow solid: mp 256-260° C.; ¹H NMR (500 MHz, CD₃OD) δ 7.67-7.65 (m, 2H), 7.50 (s, 1H), 7.09 (d, J=8.5 Hz, 1H), 6.35 (d, J=6.0 Hz, 1H), 6.10 (s, 1H), 4.58 (s, 2H), 3.92 (d, J=5.5 Hz, 2H), 3.75 (s, 3H), 3.63 (t, J=6.0 Hz, 2H), 3.15 (d, J=6.0 Hz, 2H), 1.92-1.74 (m, 6H), 1.39-1.19 (m, 5H); ESI MS m/z 392 [M+H]⁺; HPLC (Method A) 97.8% (AUC), t_(R)=14.4 min.

Example 103 Preparation of 4-(Cyclohexylmethoxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

Following the procedure of Example 102, but substituting substituting tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate for tert-butyl 7-bromo-9-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(9H)-carboxylate, the title compound (197 mg, 100%) was obtained as a pale green solid: mp 245-250° C. (decompose); ¹H NMR (500 MHz, DMSO-d₆) δ 9.21 (s, 2H), 7.55 (d, J=8.5 Hz, 1H), 7.52 (d, J=7.5 Hz, 1H), 7.50 (s, 1H), 6.99 (dd, J=8.5, 1.5 Hz, 1H), 6.04 (dd, J=7.5, 2.5 Hz, 1H), 5.85 (d, J=2.5 Hz, 1H), 4.35 (s, 2H), 3.82 (d, J=6.0 Hz, 2H), 3.68 (s, 3H), 3.54-3.53 (m, 2H), 3.09 (t, J=5.5 Hz, 2H), 1.80-1.65 (m, 6H), 1.30-1.01 (m, 5H); ESI MS m/z 392 [M+H]⁺; HPLC (Method A) >99% (AUC), t_(R)=14.3 min.

Example 104 Preparation of 4-(Cyclohexylmethoxy)-1-(2,5-dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

To a solution of 4-(cyclohexylmethoxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride (110 mg, 0.26 mmol) in CH₃OH (5 mL) was added triethylamine (90 μL, 2.5 mmol), formaldehyde (30 μL, 0.39 mmol) and NaBH(OAc)₃ (110 mg, 0.52 mmol). The reaction was stirred at room temperature until complete. The solvent was removed under reduced pressure, and the residue was dissolved in CH₂Cl₂. The organic solution was washed with H₂O and 5% aqueous LiCl and dried over Na₂SO₄. After filtration and concentration, the residue was purified by flash column chromatography (silica gel, 10% CH₃OH in CH₂Cl₂) to give 4-(cyclohexylmethoxy)-1-(2, 5-dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one as a white solid (73 mg, 69%). The free base was converted to the HCl salt to give the title compound (84 mg, 100%) as a white powder: mp 270-272° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 10.53 (s, 1H), 7.53 (d, J=7.5 Hz, 1H), 7.51 (d, J=8.0 Hz, 1H), 7.50 (d, J=1.5 Hz, 1H), 7.00 (dd, J=8.5, 1.5 Hz, 1H), 6.04 (dd, J=7.5, 2.5 Hz, 1H), 5.85 (d, J=3.0 Hz, 1H), 4.64 (d, J=13 Hz, 1H), 4.30 (dd, J=14, 7.5 Hz, 1H), 3.82 (d, J=6.0 Hz, 2H), 3.80-3.78 (m, 1H), 3.69 (s, 3H), 3.51-3.47 (m, 1H), 3.18 (t, J=5.5 Hz, 2H), 2.98 (d, J=4.5 Hz, 3H), 1.80-1.65 (m, 6H), 1.30-1.01 (m, 5H); ESI MS m/z 406 [M+H]⁺; HPLC (Method A) >99% (AUC), t_(R)=14.4 min.

Example 105 Preparation of 4-(Benzyloxy)-1-(1-(hydroxymethyl)-9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) 7-Bromo-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-1-carboxylic acid

Glyoxylic acid monohydrate (3.69 g, 40.1 mmol) was added to a solution of a 2:1 mixture of 2-(6-bromo-1H-indol-3-yl)ethanamine and 2-(4-bromo-1H-indol-3-yl)ethanamine (7.38 g, 30.9 mmol) in 0.4N HCl (50 mL), and the resulting solution was stirred at 25° C. for 30 min. The solution was adjusted to pH 3.5 with 6N NaOH solution, and the resulting tan suspension was stirred at 25° C. for 22 h. The suspension was adjusted to pH 5 with 6N NaOH solution, and the resulting suspension was filtered. The filtered solid was dried under reduced pressure to afford 3.85 g (42%) of a 2:1 mixture of the title compound and an undesired regioisomer as a tan solid: ¹H NMR (300 MHz, DMSO-d₆) δ 10.90 (s, 1H), 9.00 (br s, 1H), 7.63 (s, 1H), 7.33 (d, J=8.4 Hz, 1H), 7.12-7.04 (m, 1H), 4.66 (s, 1H), 3.50-2.70 (m, 4H). Undesired regioisomer: ¹H NMR (300 MHz, DMSO-d₆) δ 11.09 (s, 1H), 9.00 (br s, 1H), 7.47 (d, J=8.0 Hz, 1H), 7.12-7.04 (m, 1H), 6.91 (overlapping dd, J=8.0 Hz, 1H), 4.66 (s, 1H), 3.50-2.70 (m, 4H).

b) 7-Bromo-1-((tert-butyldimethylsilyloxy)methyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole

A 1.0M solution of LiAlH₄ in THF (26 mL, 26.1 mmol) was added to a solution of a 2:1 mixture of 7-bromo-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-1-carboxylic acid and the undesired regioisomer (3.85 g, 13.1 mmol) in THF (50 mL) under N₂, and the resulting solution was heated at reflux for 1 h. The solution was cooled to 0° C. and H₂O, 6N NaOH in H₂O and H₂O were added carefully in succession. The resulting suspension was filtered through celite. The filtrate was dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) afforded 2.48 g of a tan foam. Et₃N (6.2 mL, 44.3 mmol) was added to a suspension of TBSCl (6.68 g, 44.3 mmol) and the above tan foam in CH₂Cl₂ (50 mL) under N₂, and the resulting suspension was stirred at 25° C. overnight. H₂O was added to the suspension, and the phases were separated. The organic phase was dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 Et₂O/MeOH/NH₄OH), 100:0 to 75:25) yielded the title compound (1.186 g, 32%) as a clear oil: ¹H NMR (300 MHz, CDCl₃) δ 8.50 (s, 1H), 7.45 (d, J=1.7 Hz, 1H), 7.35 (d, J=8.4 Hz, 1H), 7.18 (dd, J=8.4, 1.7 Hz, 1H), 4.19-4.10 (m, 1H), 3.92 (dd, J=9.2, 5.0 Hz, 1H), 3.69 (dd, J=9.2, 9.2 Hz, 1H), 3.32 (ddd, J=12.6, 4.2, 4.2 Hz, 1H), 3.11-3.01 (m, 1H), 2.75-2.62 (m, 2H), 0.97 (s, 9H), 0.13 (s, 6H).

c) tert-Butyl 7-bromo-1-((tert-butyldimethylsilyloxy)methyl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

Boc₂O (752 mg, 3.45 mmol) was added to a suspension of 7-Bromo-1-((tert-butyldimethyl-silyloxy)methyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (1.239 g, 3.14 mmol) and K₂CO₃ (476 mg, 3.45 mmol) in a 1:1 mixture of H₂O/i-PrOH (80 mL), and the resulting suspension was stirred at 25° C. for 2 h. The suspension was filtered, and the solid was concentrated under reduced pressure. MeI (0.19 mL, 3.1 mmol) was added to a suspension of the above solid and Cs₂CO₃ (1.34 g, 4.12 mmol) in DMSO (20 mL) under N₂, and the resulting suspension was stirred at 25° C. for 4 h. H₂O was added to the suspension, and the resulting suspension was filtered. The solid was dried under reduced pressure to afford the title compound (728 mg, 46%) as a white solid: ¹H NMR (500 MHz, CDCl₃) δ 7.44 (br s, 1H), 7.37-7.28 (m, 1H), 7.23-7.15 (m, 1H), 5.49-5.43 (m, 0.6H), 5.37-5.32 (m, 0.4H), 4.56-4.48 (m, 0.4H), 4.35-4.24 (m, 0.6H), 3.98-3.84 (m, 2H), 3.68 (s, 3H), 3.43-3.35 (m, 0.6H), 3.30-3.21 (m, 0.4H), 2.90-2.75 (m, 1H), 2.72-2.63 (m, 1H), 1.50 (s, 9H), 0.90-0.82 (m, 9H), 0.14-0.02 (m, 6H).

d) 4-(Benzyloxy)-1-(1-(hydroxymethyl)-9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one

A suspension of tert-butyl 7-bromo-1-((tert-butyldimethylsilyloxy)methyl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (727 mg, 1.47 mmol), 4-(benzyl-oxy)pyridin-2(1H)-one (591 mg, 2.94 mmol), CuI (110 mg, 0.576 mmol), 8-hydroxyquinoline (84 mg, 0.58 mmol) and Cs₂CO₃ (720 mg, 2.21 mmol) in DMSO (10 mL) was degassed under reduced pressure for 45 min. The suspension was put under Ar and heated at 135° C. with stirring for 14 h. The suspension was cooled, 1:1 MeOH/NH₄OH (40 mL) was added, and the resulting suspension was stirred for 30 min. CH₂Cl₂ was added and the phases were separated. The aqueous phase was extracted with CH₂Cl₂, and the combined organic extracts were washed with brine, dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 Et₂O/MeOH/NH₄OH) 100:0 to 0:100) afforded the amine as a yellow amorphous solid. A 1.0M solution of TBAF in THF (0.57 mL, 0.57 mmol) was added to a solution of the above yellow semi-solid in THF (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 1.5 h. H₂O and CH₂Cl₂ were added to the solution and the phases were separated. The aqueous phase was extracted with CH₂Cl₂, and the combined organic phases were dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 Et₂O/MeOH/NH₄OH) 100:0 to 0:100) yielded a yellow amorphous solid. TFA (2 mL) was added to a solution of the above amorphous solid in CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 1 h. The solution was concentrated under reduced pressure. The resulting residue was diluted with CH₂Cl₂ and neutralized with a saturated aqueous NaHCO₃ solution. The phases were separated. The organic phase was dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH) 100:0 to 0:100) yielded the title compound (56 mg, 9%) as a viscous oil: ¹H NMR (500 MHz, CDCl₃) δ 7.56 (d, J=8.0 Hz, 1H), 7.46-7.37 (m, 5H), 7.32 (d, J=7.5 Hz, 1H), 7.30 (d, J=1.5 Hz, 1H), 7.03 (dd, J=8.0, 1.5 Hz, 1H), 6.11 (d, J=2.5 Hz, 1H), 6.06 (dd, J=7.5, 2.5 Hz, 1H), 5.08 (s, 2H), 4.14 (dd, J=10.0, 4.5 Hz, 1H), 3.80 (dd, J=10.0, 4.5 Hz, 1H), 3.69-3.62 (m, 4H), 3.23 (ddd, J=14.0, 4.5, 4.5 Hz, 1H), 3.12-3.05 (m, 1H), 2.78-2.73 (m, 2H); ESI MS m/z 416 [M+H]⁺.

e) 4-(Benzyloxy)-1-(1-(hydroxymethyl)-9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

A 1.0M solution of HCl in Et₂O (0.13 mL, 0.13 mmol) was added to a solution of 4-(benzyloxy)-1-(1-(hydroxymethyl)-9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one (55 mg, 0.13 mmol) in CH₂Cl₂ (10 mL) under N₂ and stirred at 25° C. for 1 h. The solution was concentrated to afford the title compound (32 mg, 54%) as an off-white powder: mp 168-170° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 9.48 (br s, 1H), 9.10 (br s, 1H), 7.56 (overlapping dd, J=8.5 Hz, 2H), 7.52 (s, 1H), 7.49-7.41 (m, 4H), 7.40-7.36 (m, 1H), 7.01 (dd, J=7.0, 1.5 Hz, 1H), 6.12 (dd, J=7.5, 1.5 Hz, 1H), 5.98 (d, J=1.5 Hz, 1H), 5.72 (t, J=3.3 Hz, 1H), 5.16 (s, 2H), 4.89-4.82 (m, 1H), 4.07-4.01 (m, 1H), 3.80-3.71 (m, 1H), 3.72 (s, 3H), 3.61-3.50 (m, 1H), 3.49-3.43 (m, 1H), 3.02-2.94 (m, 2H); ESI MS m/z 416 [M+H]⁺.

Example 106 Preparation of 4-(Benzyloxy)-1-(2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) tert-Butyl 7-(4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-9-tosyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

A suspension of 4-(benzyloxy)pyridin-2(1H)-one (426 mg, 2.12 mmol), tert-butyl 7-bromo-9-tosyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (1.28 g, 2.54 mmol), CuI (484 mg, 2.54 mmol), 8-hydroxyquinoline (369 mg, 2.54 mmol) and Cs₂CO₃ (760 mg, 2.33 mmol) in DMSO (10 mL) was degassed under reduced pressure for 45 min. The suspension was put under Ar and heated at 135° C. with stirring for 1.5 h. The suspension was cooled, 4:1 CH₂Cl₂/(9:1 MeOH/NH₄OH) (50 mL) was added and the resulting suspension was stirred at 25° C. for 10 min. The suspension was passed through a plug of silica gel and the filtrate was washed with brine. The solution was dried over Na₂SO₄ and concentrated under reduced pressure to afford an amorphous solid. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH) 100:0 to 0:100) yielded the title compound (715 mg, 54%) as an off-white solid: ¹H NMR (300 MHz, CDCl₃) δ 8.18 (br s, 1H), 7.82-7.73 (m, 2H), 7.48-7.35 (m, 6H), 7.33-7.23 (m, 4H), 6.12-5.97 (m, 2H) 5.07 (s, 2H), 4.90 (br s, 2H), 3.72-3.64 (m, 2H), 2.73-2.63 (m, 2H), 2.34 (s, 3H), 1.51 (s, 9H).

b) 4-(Benzyloxy)-1-(2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

TFA (2 mL) was added to a solution of tert-butyl 7-(4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-9-tosyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (678 mg, 1.09 mmol) in CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 1 h. Saturated NaHCO₃ solution and EtOAc were added, and the phases were separated. The aqueous phase was extracted with CH₂Cl₂, and the combined organic phases were dried over Na₂SO₄. The organic solution was concentrated under reduced pressure to afford 510 mg of an off-white solid. NaOH (469 mg, 11.7 mmol) was added to a solution of the off-white solid (123 mg) in CH₂Cl₂/MeOH (10 mL) that had been degassed with N₂. The resulting solution was heated at 40° C. with stirring for 5 h under N₂. The solution was allowed to cool, saturated NH₄Cl solution and CH₂Cl₂ were added, and the phases were separated. The organic phase was washed with saturated NaHCO₃ solution, dried over Na₂SO₄ and concentrated under reduced pressure to yield an off-white solid. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH) 100:0 to 0:100) afforded a white solid. 1M HCl in Et₂O (0.28 ml, 0.28 mmol) was added to a solution of the white solid in CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 30 min. The resulting suspension was filtered. The solid was washed with CH₂Cl₂ and dried under reduced pressure to afford the title compound (26 mg, 24%) as a white solid: mp 246-248° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 11.22 (s, 1H), 9.29 (br s, 2H), 7.54 (dd, J=12.0, 8.0 Hz, 2H), 7.50-7.41 (m, 4H), 7.40-7.33 (m, 2H), 6.96 (dd, J=8.0, 1.5 Hz, 1H), 6.09 (dd, J=7.5, 2.5 Hz, 1H), 5.97 (d, J=2.5 Hz, 1H), 5.15 (s, 2H), 4.38 (s, 2H), 3.50-3.42 (m, 2H) 3.00-2.92 (m, 2H); ESI MS m/z 372 [M+H]⁺.

Example 107 Preparation of 4-(Benzyloxy)-1-(2-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) 4-(Benzyloxy)-1-(2-methyl-9-tosyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one

TFA (2 mL) was added to a solution of tert-butyl 7-(4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-9-tosyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (678 mg, 1.09 mmol) in CH₂Cl₂ (10 mL) under N₂ and the resulting solution was stirred at 25° C. for 1 h. Saturated NaHCO₃ solution and EtOAc were added to the solution and the phases were separated. The aqueous phase was extracted with CH₂Cl₂ and the combined organic phases were dried over Na₂SO₄. The organic solution was concentrated under reduced pressure to afford 510 mg of an off-white solid. Formaldehyde (37% in H₂O, 0.04 mL, 0.49 mmol) was added to a solution of the off-white solid (170 mg) in 1:1 MeOH/CH₂Cl₂ (10 mL) and the resulting solution was stirred at 25° C. for 45 min. NaBH(OAc)₃ (137 mg, 0.648 mmol) was added to the solution and the resulting suspension was stirred at 25° C. for 30 min. The suspension was concentrated under reduced pressure and the resulting residue was diluted with CH₂Cl₂ and saturated NaHCO₃ solution. The phases were separated. The organic phase was dried over Na₂SO₄ and concentrated under reduced pressure to yield the title compound (174 mg, 89%) as a viscous oil: ¹H NMR (300 MHz, CDCl₃) δ 8.14 (d, J=1.5 Hz, 1H), 7.72 (d, J=8.4 Hz, 2H), 7.47-7.35 (m, 6H), 7.33-7.28 (m, 1H), 7.26-7.21 (m, 3H), 6.12-6.05 (m, 2H), 5.07 (s, 2H), 3.92 (br s, 2H), 2.79-2.70 (m, 4H), 2.56 (s, 3H), 2.33 (s, 3H).

b) 4-(Benzyloxy)-1-(2-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

NaOH (644 mg, 16.1 mmol) was added to a solution of the 4-(benzyloxy)-1-(2-methyl-9-tosyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one (174 mg, 0.322 mmol) in CH₂Cl₂/MeOH (10 mL) that had been degassed with N₂. The resulting solution was heated at reflux with stirring for 2 h under N₂. The solution was allowed to cool, saturated NH₄Cl solution and CH₂Cl₂ were added, and the phases were separated. The organic phase was washed with saturated NaHCO₃ solution, dried over Na₂SO₄ and concentrated under reduced pressure to yield a white solid. 1M HCl in Et₂O (0.38 ml, 0.38 mmol) was added to a solution of the white solid in 9:1 CH₂Cl₂/MeOH (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 30 min. The solution was concentrated, and the residue was diluted with a small amount of CH₂Cl₂/CH₃CN. The resulting suspension was filtered, and the solid was dried under reduced pressure to yield the title compound (46 mg, 34%) as a white solid: mp 168-170° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 11.30 (s, 1H), 10.50-10.41 (m, 1H), 7.58-7.52 (m, 2H), 7.49-7.40 (m, 4H), 7.39-7.35 (m, 2H), 6.96 (br d, J=8.0 Hz, 1H), 6.09 (br d, J=7.5 Hz, 1H), 5.97 (br s, 1H), 5.15 (s, 2H), 4.60 (br d, J=15.0 Hz, 1H), 4.41 (dd, J=15.0, 7.5 Hz, 1H), 3.78-3.71 (m, 1H), 3.45-3.38 (m, 1H), 3.09-2.98 (m, 5H); ESI MS m/z 386 [M+H]⁺.

Example 108 Preparation of 1-(2,3,4,9-Tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(4-(trifluoro-methyl)phenyl)pyridin-2(1H)-one hydrochloride a) tert-Butyl 7-(2-oxo-4-(4-(trifluoromethyl)phenyl)pyridin-1 (2H)-yl)-9-tosyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

A suspension of 4-(4-(trifluoromethyl)phenyl)pyridin-2(1H)-one (121 mg, 0.504 mmol), tert-butyl 7-bromo-9-tosyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (305 mg, 0.605 mmol), CuI (115 mg, 0.605 mmol), 8-hydroxyquinoline (88 mg, 0.605 mmol) and Cs₂CO₃ (181 mg, 0.605 mmol) in DMSO (5 mL) was degassed under reduced pressure for 45 min. The suspension was put under Ar and heated at 135° C. with stirring for 2.5 h. The suspension was cooled, 4:1 CH₂Cl₂/(9:1 MeOH/NH₄OH) (25 mL) was added and the resulting suspension was stirred at 25° C. for 10 min. The suspension was passed through a plug of silica gel and the filtrate was washed with brine. The solution was dried over Na₂SO₄ and concentrated under reduced pressure to afford an amorphous solid. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH) 100:0 to 0:100) gave the title compound (170 mg, 51%) as a pink foam: ¹H NMR (300 MHz, CDCl₃) δ 8.26 (br s, 1H), 7.83-7.74 (m, 6H), 7.53 (d, J=7.2 Hz, 1H), 7.51-7.45 (m, 1H), 7.35-7.23 (m, 3H), 6.93 (d, J=1.8 Hz, 1H), 6.54 (dd, J=7.2, 1.8 Hz, 1H), 4.91 (br s, 2H), 3.75-3.65 (m, 2H), 2.73-2.68 (m, 2H), 2.36 (s, 3H), 1.52 (s, 9H).

b) 1-(2,3,4,9-Tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(4-(trifluoromethyl)phenyl)pyridin-2(1H)-one hydrochloride

TFA (1 mL) was added to a solution of tert-butyl 7-(2-oxo-4-(4-(trifluoro-methyl)phenyl)pyridin-1(2H)-yl)-9-tosyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (170 mg, 0.256 mmol) in CH₂Cl₂ (5 mL) under N₂, and the resulting solution was stirred at 25° C. for 30 min. Saturated NaHCO₃ solution and CH₂Cl₂ were added to the solution, and the phases were separated. The organic phase was dried over Na₂SO₄ and concentrated under reduced pressure to afford 145 mg of a pink solid. NaOH (227 mg, 5.67 mmol) was added to a solution of the pink solid (64 mg) in CH₂Cl₂/MeOH (10 mL) that had been degassed with N₂. The resulting solution was heated at reflux with stirring for 7 h under N₂. The solution was allowed to cool, saturated NH₄Cl solution and CH₂Cl₂ were added, and the phases were separated. The organic phase was washed with saturated NaHCO₃ solution, dried over Na₂SO₄ and concentrated under reduced pressure to yield a yellow powder. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH) 100:0 to 0:100) afforded a yellow solid. 1M HCl in Et₂O (0.07 ml, 0.06 mmol) was added to a solution of the yellow solid in 9:1 CH₂Cl₂/MeOH (10 mL) under N₂ and the resulting solution was stirred at 25° C. for 30 min. The solution was concentrated under reduced pressure to yield the title compound (27 mg, 54%) as a yellow solid: ¹H NMR (500 MHz, DMSO-d₆) δ 11.28 (s, 1H), 9.21 (br s, 2H), 8.01 (d J=8.3 Hz, 2H), 7.88 (d, J=8.3 Hz, 2H), 7.80 (d, J=7.0 Hz, 1H), 7.58 (d, J=8.0 Hz, 1H), 7.49 (d, J=1.5 Hz, 1H), 7.07 (dd, J=8.0, 1.5 Hz, 1H), 6.87 (d, J=2.0 Hz, 1H), 6.72 (dd, J=7.0, 2.0 Hz, 1H), 4.40 (s, 2H), 3.52-3.48 (m, 2H), 2.99 (t, J=6.0 Hz, 2H); ESI MS m/z 410 [M+H]⁺.

Example 109 Preparation of 1-(2-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(4-(trifluoro-methyl)phenyl)pyridin-2(1H)-one hydrochloride a) 1-(2-Methyl-9-tosyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(4-(trifluoromethyl)phenyl)pyridin-2(1H)-one

TFA (1 mL) was added to a solution of tert-butyl 7-(2-oxo-4-(4-(trifluoro-methyl)phenyl)pyridin-1(2H)-yl)-9-tosyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (170 mg, 0.256 mmol) in CH₂Cl₂ (5 mL) under N₂, and the resulting solution was stirred at 25° C. for 30 min. Saturated NaHCO₃ solution and CH₂Cl₂ were added to the solution, and the phases were separated. The organic phase was dried over Na₂SO₄ and concentrated under reduced pressure to afford 145 mg of a pink solid. Formaldehyde (37% in H₂O, 0.02 mL, 0.2 mmol) was added to a solution of the pink solid (80 mg) in 1:1 MeOH/CH₂Cl₂ (4 mL) and the resulting solution was stirred at 25° C. for 45 min. NaBH(OAc)₃ (60 mg, 0.28 mmol) was added to the solution and the resulting suspension was stirred at 25° C. for 30 min. The suspension was concentrated under reduced pressure. The residue was diluted with CH₂Cl₂ and saturated NaHCO₃ solution. The phases were separated. The organic phase was dried over Na₂SO₄ and concentrated under reduced pressure to yield the title compound (61 mg, 74%) as a pink foam: ¹H NMR (300 MHz, CDCl₃) δ 8.23 (d, J=1.8 Hz, 1H), 7.79-7.71 (m, 6H), 7.53 (d, J=7.2 Hz, 1H), 7.47 (d, J=8.4 Hz, 1H), 7.32 (dd, J=8.4, 1.8 Hz, 1H), 7.27-7.22 (m, 2H), 6.93 (d, J=1.8 Hz, 1H), 6.53 (dd, J=7.2, 1.8 Hz, 1H), 3.93 (br s, 2H), 2.80-2.60 (m, 4H), 2.57 (s, 3H), 2.34 (s, 3H).

b) 1-(2-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(4-(trifluoro-methyl)phenyl)pyridin-2(1H)-one hydrochloride

NaOH (211 mg, 5.28 mmol) was added to a solution of 1-(2-methyl-9-tosyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(4-(trifluoromethyl)phenyl)pyri din-2(1H)-one (61 mg, 0.11 mmol) in CH₂Cl₂/MeOH (10 mL) that had been degassed with N₂. The resulting solution was heated at reflux with stirring for 7 h under N₂. The solution was allowed to cool, saturated NH₄Cl solution and CH₂Cl₂ were added, and the phases were separated. The organic phase was washed with saturated NaHCO₃ solution, dried over Na₂SO₄ and concentrated under reduced pressure to yield a yellow solid. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH) 100:0 to 0:100) afforded a yellow solid. 1M HCl in Et₂O (0.06 ml, 0.06 mmol) was added to a solution of the yellow solid in 9:1 CH₂Cl₂/MeOH (10 mL) under N₂ and the resulting solution was stirred at 25° C. for 30 min. The solution was concentrated under reduced pressure to yield the title compound (28 mg, 58%) as a yellow solid: mp 200-204° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 11.36 (s, 1H), 10.35 (br s, 1H), 8.02 (d, J=8.3 Hz, 2H), 7.88 (d, J=8.3 Hz, 2H), 7.80 (d, J=7.0 Hz, 1H), 7.59 (d, J=8.0 Hz, 1H), 7.49 (br s, 1H), 7.07 (dd, J=8.0, 1.5 Hz, 1H), 6.87 (d, J=1.5 Hz, 1H), 6.72 (d, J=7.0, 1.5 Hz, 1H), 4.62 (br d, J=16.0 Hz, 1H), 4.49-4.40 (m, 1H), 3.81-3.73 (m, 1H), 3.49-3.39 (m, 1H), 3.12-3.00 (m, 5H); ESI MS m/z 424 [M+H]⁺.

Example 110 Preparation of 4-(Benzyloxy)-1-(1,1,9-trimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) 7-Bromo-1,1-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole

Concentrated HCl (10 mL) was added to a suspension of a 2:1 mixture of 2-(6-bromo-1H-indol-3-yl)ethanamine and 2-(4-bromo-1H-indol-3-yl)ethanamine (9.90 g, 41.4 mmol) and Na₂SO₄ (30 g) in 1:1 acetone/n-butanol (100 mL). The resulting suspension was heated at 60° C. with stirring for 4 d. The suspension was cooled and concentrated under reduced pressure. The residue was diluted with EtOAc, and the suspension was filtered. The filtrate was washed with saturate NaHCO₃ solution, dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH) 100:0 to 0:100) yielded the title compound (1.68 g, 15%) as a red foam: ¹H NMR (500 MHz, CDCl₃) δ 7.66 (br s, 1H), 7.45 (d, J=1.5 Hz, 1H), 7.32 (d, J=8.5 Hz, 1H), 7.19 (dd, J=8.5, 1.5 Hz, 1H), 3.20 (t, J=5.5 Hz, 2H), 2.68 (t, J=5.5 Hz, 2H), 1.47 (s, 6H).

b) tert-Butyl 7-bromo-1,1,9-trimethyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

Boc₂O (7.88 g, 36.1 mmol) was added to a suspension of 7-bromo-1,1-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (1.68 g, 6.02 mmol) and K₂CO₃ (1.66 g, 12.0 mmol) in 1:1 H₂O/i-PrOH (80 mL), and the resulting suspension was stirred at 25° C. for 2 h. The suspension was filtered. The solid was washed with H₂O and dried under reduced pressure to afford 1.285 g of a white solid. NaH (60% dispersion in oil, 152 mg, 3.80 mmol) was added to a solution of the white solid (720 mg) in DMF (10 mL) under N₂ and the resulting suspension was stirred at 25° C. for 30 min. MeI (0.18 mL, 2.9 mmol) was added to the suspension, and the resulting suspension was stirred at 25° C. for 30 min. The suspension was cooled to 0° C., and H₂O was added slowly. Hexanes was added and the phases were separated. The organic phase was dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, hexanes/(1:1 EtOAc/hexanes) 100:0 to 60:40) yielded the title compound (471 mg, 36%) as a white solid: ¹H NMR (300 MHz, CDCl₃) δ 7.43 (d, J=1.5 Hz, 1H), 7.33 (d, J=8.4 Hz, 1H), 7.20 (dd, J=8.4, 1.5 Hz, 1H), 3.79-3.72 (m, 5H), 2.73 (t, J=5.4 Hz, 2H), 1.88 (s, 6H), 1.53 (s, 9H).

c) tert-Butyl 7-(4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-1,1,9-trimethyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

A suspension of 4-(benzyloxy)pyridin-2(1H)-one (107 mg, 0.532 mmol), tert-butyl 7-bromo-1,1,9-trimethyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (251 mg, 0.639 mmol), CuI (122 mg, 0.639 mmol), 8-hydroxyquinoline (93 mg, 0.639 mmol) and Cs₂CO₃ (190 mg, 0.585 mmol) in DMSO (10 mL) was degassed under reduced pressure for 45 min. The suspension was put under Ar and heated at 135° C. with stirring overnight. The suspension was cooled, 40:9:1 CH₂Cl₂/MeOH/NH₄OH was added and the resulting suspension was stirred at 25° C. for 30 min. The suspension was passed through a plug of silica gel, and the filtrate was washed with brine. The solution was dried over Na₂SO₄ and concentrated under reduced pressure to afford an amorphous solid. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH) 100:0 to 1:1) yielded the title compound (74 mg, 27%) as a white powder: ¹H NMR (300 MHz, CDCl₃) δ 7.54 (d, J=8.1 Hz, 1H), 7.46-7.35 (m, 4H), 7.33-7.25 (m, 3H), 7.12 (dd, J=8.1, 2.1 Hz, 1H), 6.09 (d, J=2.6 Hz, 1H), 6.04 (dd, J=7.5, 2.6 Hz, 1H), 5.06 (s, 2H), 3.80 (s, 3H), 3.77 (t, J=4.8 Hz, 2H), 2.77 (t, J=4.8 Hz, 2H), 1.89 (s, 6H), 1.54 (s, 9H).

d) 4-(Benzyloxy)-1-(1,1,9-trimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

TFA (1 mL) was added to a solution of tert-butyl 7-(4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-1,1,9-trimethyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (72 mg, 0.14 mmol) in CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 30 min. Saturated NaHCO₃ solution and CH₂Cl₂ were added to the solution and the phases were separated. The organic phase was dried over Na₂SO₄ and concentrated under reduced pressure. Purification by semi-preparative HPLC (Phenomenex Luna C18 (2), 250.0×21.20 mm, 10 micron, H₂O with 0.05% TFA and CH₃CN with 0.05% TFA) afforded 14 mg of clear crystals. 1M HCl in Et₂O (0.04 ml, 0.04 mmol) was added to a solution of the clear crystals in CH₂Cl₂ (10 mL) under N₂ and the resulting solution was stirred at 25° C. for 30 min. The solution was concentrated under reduced pressure to yield the title compound (15 mg, 24%) as an off-white powder: mp 296-298; ¹H NMR (500 MHz, DMSO-d₆) δ 9.59 (s, 2H), 7.58-7.51 (m, 3H), 7.49-7.41 (m, 4H), 7.40-7.35 (m, 1H), 7.01 (dd, J=8.5, 1.5 Hz, 1H), 6.10 (dd, J=7.5, 2.8 Hz, 1H), 5.97 (d, J=2.8 Hz, 1H), 5.16 (s, 2H), 3.80 (s, 3H), 3.52-3.48 (m, 2H), 2.99 (t, J=6.0 Hz, 2H), 1.81 (s, 6H); ESI MS m/z 414 [M+H]⁺.

Example 111 Preparation of (S)-4-(Benzyloxy)-1-(9-methyl-2-(pyrrolidin-2-ylmethyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride a) (S)-tert-Butyl 2-(bromomethyl)pyrrolidine-1-carboxylate

Beilstein Registry Number 6325435

This compound was prepared in accordance with the procedure of Kawara et al., Tetrahedron Lett., 1994, 35, 8805-8808.

b) (S)-4-(Benzyloxy)-1-(9-methyl-2-(pyrrolidin-2-ylmethyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride

A suspension of 4-(benzyloxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one (250 mg, 0.646 mmol), (S)-tert-butyl 2-(bromomethyl)pyrrolidine-1-carboxylate (342 mg, 1.29 mmol) and Cs₂CO₃ (841 mg, 2.58 mmol) in DMSO (10 mL) under N₂ was stirred at 25° C. for 16 h. The suspension was heated at 60° C. for 1 d. The suspension was cooled, and H₂O was added. The suspension was filtered. The solid was washed with H₂O and dried under reduced pressure. Flash chromatograph (silica gel, hexanes/(9:0.9:0.1 Et₂O/MeOH/NH₄OH), 100:0 to 0:100) afforded 18 mg of a yellow solid. TFA (1 mL) was added to a solution of the yellow solid in CH₂Cl₂ (5 mL) under N₂ and the resulting solution was stirred at 25° C. for 3.5 h. Saturated NaHCO₃ solution and CH₂Cl₂ were added and the phases were separated. The organic phase was dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatograph (silica gel,(1:1 EtOAc/hexanes)/(9:0.9:0.1 Et₂O/MeOH/NH₄OH), 100:0 to 0:100) yielded 10 mg of a yellow solid. 1M HCl in Et₂O (0.04 ml, 0.04 mmol) was added to a solution of the yellow solid in CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 30 min. The solution was concentrated under reduced pressure to yield the title compound (10 mg, 3%) as an off-white powder: mp 160-162° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 9.25 (br s, 1H), 7.56 (d, J=7.5 Hz, 1H), 7.54-7.40 (m, 6H), 7.39-7.34 (m, 1H), 7.04-6.93 (m, 1H), 6.11 (dd, J=7.5, 2.5 Hz, 1H), 5.97 (d, J=2.5 Hz, 1H), 5.16 (s, 2H), 3.98-3.45 (m, 11H), 3.39 (s, 1H), 3.30-3.21 (m, 2H), 2.25-2.10 (m, 1H), 2.05-1.74 (m, 2H), 1.73-1.60 (m, 1H); ESI MS m/z 469 [M+H]⁺.

Example 112 Preparation of 4-(4-Chloro-2-methoxyphenyl)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) 4-(4-Chloro-2-methoxyphenyl)pyridine 1-oxide

4-Chloropyridine-N-oxide (500 mg, 3.85 mmol), 2-methoxy-4-chlorophenylboronic acid (862 mg, 4.63 mmol) and K₂CO₃ (1.59 g, 11.55 mmol) were suspended in DMSO (5 mL) and PdCl₂(dppf) (314 mg, 0.385 mmol) was added. The reaction mixture was placed under vacuum for 20 min and flushed with N₂. This process was repeated, and the reaction mixture was heated at 120° C. for 3 h. The reaction mixture was cooled to 25° C. and partitioned between methylene chloride and 5% lithium chloride. The aqueous phase was removed, and the organic phase was washed with brine, dried over Na₂SO₄, filtered and concentrated to dryness under reduced pressure. Flash chromatography (ISCO 40 g column, methylene chloride/MeOH 100:0 to 90:10) provided the title compound (673 mg, 74%) as a tan solid: ¹H NMR (300 MHz, CD₃OD) δ 8.21 (dd, J=5.4, 1.8 Hz, 2H), 7.47 (dd, J=5.6, 1.6 Hz, 2H), 7.26 (d, J=8.2 Hz, 1H), 7.06 (dd, J=8.3, 2.4 Hz, 1H), 7.00 (d, J=1.7 Hz, 1H), 3.87 (s, 3H); ESI MS m/z 235 [M+H]⁺.

b) 4-(4-Chloro-2-methoxyphenyl)pyridin-2(1H)-one

4-(4-Chloro-2-methoxyphenyl)pyridine 1-oxide (673 mg, 2.86 mmol) and acetic anhydride (10 mL) were heated at reflux for 3 h. The mixture was concentrated under reduced pressure, and a 1:1 solution of H₂O/MeOH (20 mL) was added. The reaction mixture was heated to reflux for 1 h, cooled to 25° C. and concentrated under reduced pressure. The resulting residue was dissolved in hot 2-propanol (3 mL), triturated with Et₂O, sonicated for 30 min then placed in the freezer. The solid was filtered off providing the title compound (550 mg, 91%) as a tan solid: ¹H NMR (500 MHz, DMSO-d₆) δ 11.54 (s, 1H), 7.35-7.33 (m, 2H), 7.01 (s, 1H), 7.08 (d, J=6.6 Hz, 1H), 6.36 (s, 1H), 6.28 (s, 1H), 3.82 (s, 3H); ESI MS m/z 235 [M+H]⁺.

c) tert-Butyl 7-(4-(4-chloro-2-methoxyphenyl)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

A suspension of 4-(4-chloro-2-methoxyphenyl)pyridin-2(1H)-one (126 mg, 0.534 mmol), tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (234 mg, 0.641 mmol), CuI (122 mg, 0.641 mmol), 8-hydroxyquinoline (93 mg, 0.64 mmol) and Cs₂CO₃ (191 mg, 0.587 mmol) in DMSO (5 mL) was degassed under reduced pressure for 45 min. The suspension was put under Ar and heated at 135° C. with stirring overnight. The suspension was cooled, 40:9:1 CH₂Cl₂/MeOH/NH₄OH was added, and the resulting suspension was stirred at 25° C. for 10 min. The suspension was passed through a plug of silica gel, and the filtrate was washed with brine. The solution was dried over Na₂SO₄ and concentrate under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH) 100:0 to 0:100) gave the title compound (123 mg, 44%) as a yellow solid: ¹H NMR (300 MHz, CDCl₃) δ 7.54 (d, J=8.1 Hz, 1H), 7.42-7.35 (m, 2H), 7.31 (d, J=8.1 Hz, 1H), 7.12-7.02 (m, 2H), 6.99 (d, J=1.8 Hz, 1H), 6.81 (d, J=1.8 Hz, 1H), 6.44 (dd, J=7.2, 1.8 Hz, 1H), 4.65 (br s, 2H), 3.88 (s, 3H), 3.90-3.81 (m, 2H), 3.65 (s, 3H), 2.87-2.79 (m, 2H), 1.51 (s, 9H).

d) 4-(4-Chloro-2-methoxyphenyl)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

TFA (2 mL) was added to a solution of tert-butyl 7-(4-(4-chloro-2-methoxyphenyl)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (124 mg, 0.238 mmol) in CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 1 h. Saturated NaHCO₃ solution and CH₂Cl₂ were added to the solution, and the phases were separated. The organic phase was dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH) 100:0 to 0:100) yielded 70 mg of an off-white solid. 1M HCl in Et₂O (0.03 ml, 0.03 mmol) was added to a solution of the off-white solid (10 mg) in CH₂Cl₂ (10 mL) under N₂ and the resulting solution was stirred at 25° C. for 30 min. The solution was concentrated under reduced pressure to yield the title compound (9 mg, 26%) as an off-white powder: mp 290-292° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 9.17 (br s, 2H), 7.65 (d, J=7.0 Hz, 1H), 7.62 (d, J=1.8 Hz, 1H), 7.59 (d, J=8.5 Hz, 1H), 7.44 (d, J=8.0 Hz, 1H), 7.26 (d, J=1.8 Hz, 1H), 7.14 (dd, J=8.0, 1.8 Hz, 1H), 7.09 (dd, J=8.5, 1.8 Hz, 1H), 6.57 (d, J=2.0 Hz, 1H), 6.47 (dd, J=7.0, 2.0 Hz, 1H), 4.37 (br s, 2H), 3.87 (s, 3H), 3.70 (s, 3H), 3.57-3.52 (m, 2H), 3.10 (t, J=6.0 Hz, 2H); ESI MS m/z 420 [M+H]⁺.

Example 113 Preparation of 4-(4-Chloro-2-methoxyphenyl)-1-(2,5-dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) 4-(4-Chloro-2-methoxyphenyl)-1-(2,5-dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

TFA (2 mL) was added to a solution of tert-butyl 7-(4-(4-chloro-2-methoxyphenyl)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (124 mg, 0.238 mmol) in CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 1 h. Saturated NaHCO₃ solution and CH₂Cl₂ were added to the solution, and the phases were separated. The organic phase was dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) yielded 70 mg of an off-white solid. Formaldehyde (37% in H₂O, 0.02 mL, 0.2 mmol) was added to a solution of the off-white solid (43 mg) in 1:1 MeOH/CH₂Cl₂ (5 mL) and the resulting solution was stirred at 25° C. for 45 min. NaBH(OAc)₃ (43 mg, 0.20 mmol) was added to the solution, and the resulting suspension was stirred at 25° C. for 30 min. The suspension was concentrated under reduced pressure, and the resulting residue was diluted with CH₂Cl₂ and saturated NaHCO₃ solution. The phases were separated. The organic phase was dried over Na₂SO₄ and concentrated under reduced pressure. Purification by semi-preparative HPLC (Phenomenex Luna C18 (2), 250.0×21.20 mm, 10 micron, H₂O with 0.05% TFA and CH₃CN with 0.05% TFA) afforded 13 mg of an off-white solid. 1M HCl in Et₂O (0.03 ml, 0.03 mmol) was added to a solution of the off-white solid in CH₂Cl₂ (10 mL) under N₂ and the resulting solution was stirred at 25° C. for 30 min. The solution was concentrated under reduced pressure to yield the title compound (14 mg, 17%) as an off-white powder: mp 270-272° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 10.15 (br s, 1H), 7.66 (d, J=7.0 Hz, 1H), 7.63 (d, J=1.5 Hz, 1H), 7.55 (d, J=8.0 Hz, 1H), 7.44 (d, J=8.5 Hz, 1H), 7.26 (d, J=1.8 Hz, 1H), 7.14 (dd, J=8.5, 1.5 Hz, 1H), 7.11 (dd, J=8.0, 1.8 Hz, 1H), 6.57 (d, J=2.0 Hz, 1H), 6.47 (dd, J=7.0, 2.0 Hz, 1H), 4.67 (d, J=13.5 Hz, 1H), 4.33 (dd, J=14.3, 6.0 Hz, 1H), 3.87 (s, 3H), 3.86-3.79 (m, 1H), 3.71 (s, 3H), 3.55-3.47 (m, 1H), 3.24-3.15 (m, 2H), 3.01 (s, 3H); ESI MS m/z 434 [M+H]⁺.

Example 114 Preparation of 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(pyrimidin-2-ylmethoxy)pyridin-2(1H)-one dihydrochloride a) 4-(Pyrimidin-2-ylmethoxy)pyridine 1-oxide

Following the procedure of Example 137 (step a), but substituting pyrimidin-2ylmethanol (3.0 g, 27 mmol) for imidazo[1,2-a]pyridine-2-ylmethanol, the title compound (0.95 g, 17%) was prepared as an orange solid: ¹H NMR (300 MHz, CD₃OD) δ 8.81 (d, J=5.1 Hz, 2H), 8.23-8.21 (m, 2H), 7.45 (t, J=4.8 Hz, 1H), 7.24-7.21 (m, 2H), 5.46 (s, 2H).

b) 4-(Pyrimidin-2-ylmethoxy)pyridin 2(1H)-one

Following the procedure of Example 137 (step b), but substituting 4-(pyrimidin-2-ylmethoxy)pyridine 1-oxide (0.95 g, 4.6 mmol) for 4-(imidazo[1,2-a]pyridin-2-ylmethoxy)pyridine 1-oxide, the title compound (0.55 g, 58%) was prepared as a dark brown solid: ¹H NMR (500 MHz, DMSO-d₆) δ 11.09 (br s, 1H), 8.84 (d, J=4.5 Hz, 2H), 7.48 (t, J=5.0 Hz, 1H), 7.25-7.23 (m, 1H), 5.92 (dd, J=7.0, 2.5 Hz, 1H), 5.66 (d, J=8.0, 2.5 Hz, 1H), 5.23 (s, 2H).

c) tert-Butyl 5-methyl-7-(2-oxo-4-(pyrimidin-2-ylmethoxy)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

A suspension of 4-(pyrimidin-2-ylmethoxy)pyridin-2(1H)-one (242 mg, 1.19 mmol), tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (522 mg, 1.43 mmol), CuI (272 mg, 1.43 mmol), 8-hydroxyquinoline (35 mg, 0.24 mmol) and Cs₂CO₃ (426 mg, 1.31 mmol) in DMSO (10 mL) was degassed under reduced pressure for 45 min. The suspension was put under Ar and heated at 135° C. with stirring overnight. The suspension was cooled, 40:9:1 CH₂Cl₂/MeOH/NH₄OH (50 mL) was added, and the resulting suspension was stirred at 25° C. for 1 h. The suspension was passed through a plug of silica gel, and the filtrate was washed with brine. The solution was dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(4:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) yielded the title compound (256 mg, 44%) as a yellow solid: ¹H NMR (500 MHz, CDCl₃) δ 8.81 (d, J=4.5 Hz, 1H), 7.50 (d, J=8.0 Hz, 1H), 7.32 (d, J=7.5 Hz, 1H), 7.31-7.27 (m, 3H), 7.01 (br d, J=8.0 Hz, 1H), 6.17 (dd, J=7.5, 2.8 Hz, 1H), 6.00 (d, J=2.8 Hz, 1H), 5.32 (s, 2H), 4.64 (br s, 2H), 3.88-3.79 (m, 2H), 3.62 (s, 3H), 2.84-2.78 (m, 2H), 1.50 (s, 9H).

d) 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(pyrimidin-2-ylmethoxy)pyridin-2(1H)-one dihydrochloride

TFA (2 mL) was added to a solution of tert-butyl 5-methyl-7-(2-oxo-4-(pyrimidin-2-ylmethoxy)pyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (256 mg, 0.525 mmol) in CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 1 h. Saturated NaHCO₃ solution and CH₂Cl₂ were added to the solution, and the phases were separated. The organic phase was dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(4:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) yielded 35 mg of a yellow foam. 1M HCl in Et₂O (0.08 ml, 0.08 mmol) was added to a solution of the yellow foam (16 mg) in CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 30 min. The solution was concentrated under reduced pressure to yield the title compound (16 mg, 14%) as an off-white powder: mp 234-236° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 9.10 (br s, 2H), 8.88 (d, J=5.0 Hz, 2H), 7.58-7.52 (m, 4H), 6.99 (dd, J=8.0, 1.8 Hz, 1H), 6.14 (dd, J=7.5, 2.5 Hz, 1H), 5.86 (d, J=2.5 Hz, 1H), 5.33 (s, 2H), 4.36 (br s, 2H), 3.68 (s, 3H), 3.57-3.52 (m, 2H), 3.11-3.05 (m, 2H); ESI MS m/z 388 [M+H]⁺.

Example 115 Preparation of 4-(Imidazo[1,2-a]pyridin-6-ylmethoxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride a) tert-Butyl 7-(4-(imidazo[1,2-a]pyridin-6-ylmethoxy)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

A suspension of 4-(imidazo[1,2-a]pyridin-6-ylmethoxy)pyridin-2(1H)-one (270 mg, 1.12 mmol), tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (493 mg, 1.35 mmol), CuI (257 mg, 1.35 mmol), 8-hydroxyquinoline (98 mg, 0.67 mmol) and Cs₂CO₃ (401 mg, 1.23 mmol) in DMSO (10 mL) was degassed under reduced pressure for 45 min. The suspension was put under Ar and heated at 135° C. with stirring for 4.5 h. The suspension was cooled, 40:9:1 CH₂Cl₂/MeOH/NH₄OH (50 mL) was added, and the resulting suspension was stirred at 25° C. for 30 min. The suspension was passed through a plug of silica gel, and the filtrate was washed with brine. The solution was dried over Na₂SO₄ and concentrate under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(4:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) yielded the title compound (167 mg, 28%) as a yellow solid: ¹H NMR (300 MHz, CDCl₃) δ 8.34-8.25 (m, 1H), 7.79-7.61 (m, 3H), 7.58-7.50 (m, 1H), 7.40-7.25 (m, 3H), 7.07-6.69 (m, 1H), 6.17-6.10 (m, 1H), 6.09-6.02 (m, 1H), 5.11 (s, 2H), 4.65 (br s, 2H), 3.92-3.80 (m, 2H), 3.65 (s, 3H), 2.89-2.80 (m, 2H), 1.52 (s, 9H); ESI MS m/z 526 [M+H]⁺.

b) 4-(Imidazo[1,2-a]pyridin-6-ylmethoxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride

TFA (2 mL) was added to a solution of tert-butyl 7-(4-(imidazo[1,2-a]pyridin-6-ylmethoxy)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (167 mg, 0.317 mmol) in CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 1 h. Saturated NaHCO₃ solution and CH₂Cl₂ were added to the solution, and the phases were separated. The organic phase was dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(4:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) yielded 51 mg of a yellow solid. Purification by semi-preparative HPLC (Phenomenex Luna C18 (2), 250.0×21.20 mm, 10 micron, H₂O with 0.05% TFA and CH₃CN with 0.05% TFA) afforded 7 mg of a white solid. 1M HCl in Et₂O (0.03 ml, 0.03 mmol) was added to a solution of the white solid (7 mg) in CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 30 min. The solution was concentrated under reduced pressure to yield the title compound (8 mg, 5%) as a white powder: ¹H NMR (500 MHz, DMSO-d₆) δ 9.28 (br s, 2H), 9.06 (s, 1H), 8.38 (s, 1H), 8.19 (s, 1H), 8.05-7.94 (m, 2H), 7.62 (d, J=7.5 Hz, 1H), 7.56 (d, J=8.0 Hz, 1H), 7.50 (d, J=1.5 Hz, 1H), 6.99 (dd, J=8.0, 1.5 Hz, 1H), 6.13 (dd, J=7.5, 2.5 Hz, 1H), 6.09 (d, J=2.5 Hz, 1H), 5.33 (s, 2H), 4.35 (br s, 2H), 3.69 (s, 3H), 3.56-3.50 (m, 2H), 3.12-3.05 (m, 2H); ESI MS m/z 426 [M+H]⁺.

Example 116 Preparation of 4-(Imidazo[1,2-a]pyridin-2-ylmethoxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride a) tert-Butyl 7-(4-(imidazo[1,2-a]pyridin-2-ylmethoxy)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

A suspension of 4-(imidazo[1,2-a]pyridin-2-ylmethoxy)pyridin-2(1H)-one (231 mg, 0.960 mmol), tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (421 mg, 1.15 mmol), CuI (219 mg, 1.15 mmol), 8-hydroxyquinoline (84 mg, 0.576 mmol) and Cs₂CO₃ (345 mg, 1.06 mmol) in DMSO (10 mL) was degassed under reduced pressure for 45 min. The suspension was put under Ar and heated at 135° C. with stirring overnight. The suspension was cooled, 40:9:1 CH₂Cl₂/MeOH/NH₄OH (50 mL) was added, and the resulting suspension was stirred at 25° C. for 30 min. The suspension was passed through a plug of silica gel, and the filtrate was washed with brine and 10% CuSO₄ solution. The solution was dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(4:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) gave the title compound (132 mg, 26%) as a yellow solid: ¹H NMR (300 MHz, CDCl₃) δ 8.12 (d, J=6.9 Hz, 1H), 7.70 (br s, 1H), 7.62 (d, J=8.7 Hz, 1H), 7.50 (d, J=8.4 Hz, 1H), 7.33-7.18 (m, 3H), 7.02 (d, J=7.5 Hz, 1H), 6.82 (dd, J=6.9, 6.9 Hz, 1H), 6.17 (d, J=2.1 Hz, 1H), 6.08 (dd, J=7.5, 2.1 Hz, 1H), 5.25 (s, 2H), 3.84 (br s, 2H), 3.63 (s, 3H), 2.84-2.79 (m, 2H), 1.72-1.60 (m, 2H), 1.50 (s, 9H).

b) 4-(Imidazo[1,2-a]pyridin-2-ylmethoxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride

TFA (1 mL) was added to a solution of tert-butyl 7-(4-(imidazo[1,2-a]pyridin-2-ylmethoxy)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (132 mg, 0.251 mmol) in CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 1 h. Saturated NaHCO₃ solution and CH₂Cl₂ were added to the solution, and the phases were separated. The aqueous phase was extracted with EtOAc. The combined organic phases were dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(4:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) yielded 42 mg of an off-white solid. 1M HCl in Et₂O (0.07 ml, 0.07 mmol) was added to a solution of the off-white solid (15 mg) in CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 30 min. The solution was concentrated under reduced pressure to yield the title compound (15 mg, 34%) as a white powder: ¹H NMR (500 MHz, DMSO-d₆) δ 9.30 (br s, 2H), 8.84 (s, 1H), 8.37 (s, 1H), 7.89-7.70 (m, 2H), 7.64-7.53 (m, 2H), 7.50 (s, 1H), 7.37-7.29 (m, 1H), 7.03-6.97 (m, 1H), 6.20-6.09 (m, 2H), 5.41 (s, 2H), 4.35 (br s, 2H), 3.69 (s, 3H), 3.58-3.50 (m, 2H), 3.13-3.07 (m, 2H); ESI MS m/z 426 [M+H]⁺.

Example 117 Preparation of 1-(2,5-Dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(imidazo[1,2-a]pyridin-2-ylmethoxy)pyridin-2(1H)-one dihydrochloride a) 1-(2,5-Dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(imidazo[1,2-a]pyridin-2-ylmethoxy)pyridin-2(1H)-one dihydrochloride

TFA (1 mL) was added to a solution of tert-butyl 7-(4-(imidazo[1,2-a]pyridin-2-ylmethoxy)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (132 mg, 0.251 mmol) in CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 1 h. Saturated NaHCO₃ solution and CH₂Cl₂ were added to the solution, and the phases were separated. The aqueous phase was extracted with EtOAc. The combined organic phases were dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(4:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) yielded 42 mg of an off-white solid. Formaldehyde (37% in H₂O, 0.01 mL, 0.12 mmol) was added to a solution of the off-white solid (27 mg) in 1:1 MeOH/CH₂Cl₂ (5 mL), and the resulting solution was stirred at 25° C. for 45 min. NaBH(OAc)₃ (27 mg, 0.13 mmol) was added to the solution, and the resulting suspension was stirred at 25° C. for 30 min. The suspension was concentrated under reduced pressure, and the residue was diluted with CH₂Cl₂ and saturated NaHCO₃ solution. The phases were separated. The organic phase was dried over Na₂SO₄ and concentrated under reduced pressure to afford 25 mg of a viscous oil. 1M HCl in Et₂O (0.11 ml, 0.11 mmol) was added to a solution of the off-white solid in CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 30 min. The solution was concentrated under reduced pressure to yield the title compound (25 mg, 30%) as an off-white powder: ¹H NMR (500 MHz, DMSO-d₆) 10.79 (br s, 1H), 8.87 (d, J=6.5 Hz, 1H), 8.41 (s, 1H), 7.90-7.78 (m, 2H), 7.61 (d, J=7.5 Hz, 1H), 7.53-7.49 (m, 2H), 7.42-7.35 (m, 1H), 7.00 (dd, J=8.5, 1.5 Hz, 1H), 6.15 (d, J=2.5 Hz, 1H), 6.12 (dd, J=7.5, 2.5 Hz, 1H), 5.43 (s, 2H), 4.62 (d, J=14.0 Hz, 1H), 4.29 (dd, J=14.0, 7.5 Hz, 1H), 3.80-3.75 (m, 1H), 3.69 (s, 3H), 3.55-3.46 (m, 1H), 3.23-3.16 (m, 2H), 2.97 (s, 3H); ESI MS m/z 440 [M+H]⁺.

Example 118 Preparation of 1-(2-Acetyl-9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(benzyloxy)pyridin-2(1H)-one

AcCl (0.023 mL, 0.32 mmol) was added to a solution of 4-(benzyloxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride (100 mg, 0.216 mmol), DMAP (5 mg, 0.04 mmol) and Et₃N (0.09 mL, 0.6 mmol) in CH₂Cl₂ (20 mL) under N₂, and the resulting solution was stirred at 25° C. for 4 h. H₂O was added to the solution, and the phases were separated. The organic phase was washed with saturated NH₄Cl solution, dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) afforded the title compound (61 mg, 66%) as a mixture of rotomers as a white powder: mp 80-82° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 7.56 (d, J=7.5 Hz, 1H), 7.52-7.35 (m, 7H), 6.94 (dd, J=8.0, 1.5 Hz, 1H), 6.12-6.08 (m, 1H), 5.97 (d, J=3.0 Hz, 1H), 5.15 (s, 2H), 4.77-4.72 (m, 2H), 3.82-3.72 (m, 2H), 3.69-3.65 (m, 3H), 3.82-2.78 (m, 1.3H), 2.71-2.68 (m, 0.7H), 2.16 (s, 3H); ESI MS m/z 428 [M+H]⁺.

Example 119 Preparation of 1-(2-Acetyl-5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one

AcCl (0.03 mL, 0.4 mmol) was added to a solution of 1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one (125 mg, 0.294 mmol), DMAP (7 mg, 0.06 mmol) and Et₃N (0.08 mL, 0.6 mmol) in CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 17 h. H₂O was added to the solution, and the phases were separated. The organic phase was washed with saturated NH₄Cl solution, dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) afforded the title compound (116 mg, 84%) as a mixture of rotomers as a white powder: mp 232-236° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 9.15 (s, 1H), 8.38 (d, J=8.3 Hz, 1H), 8.35 (d, J=8.3 Hz, 1H), 7.84 (d, J=7.5 Hz, 1H), 7.59-7.54 (m, 2H), 7.28 (d, J=1.5 Hz, 1H), 7.08-7.03 (m, 2H), 4.70 (s, 0.8H), 4.68 (s, 1.2H), 3.88 (t, J=5.5 Hz, 0.8H), 3.83 (t, J=5.5 Hz, 1.2H), 3.67 (s, 3H), 2.97-2.91 (m, 1.2H), 2.86-2.81 (m, 0.8H), 2.15 (s, 1.8H), 2.13 (s, 1.2H); ESI MS m/z 467 [M+H]⁺.

Example 120 Preparation of 1-(2-Ethyl-5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one dihydrochloride

2-Picoline borane (63 mg, 0.59 mmol) was added to a suspension of 1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one dihydrochloride (98 mg, 0.20 mmol) and acetylaldhyde (0.03 mL, 1 mmol) in 9:1 CH₂Cl₂/AcOH (10 mL) under N₂, and the resulting solution was stirred under N₂ for 4 h. Acetylaldhyde (0.03 mL, 1 mmol) was added to the solution under N₂ and the resulting solution was stirred at 25° C. for 15 min. The solution was neutralized with saturated NaHCO₃ solution, and the phases were separated. The organic phase was dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) afforded 67 mg of a yellow powder. 2N HCl in Et₂O (0.15 mL, 0.330 mmol) was added to a solution of the yellow powder in 1:1 MeOH/CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 15 min. Et₂O was added to the solution, and the resulting suspension was filtered under N₂ to afford the title compound (78 mg, 75%) as a yellow powder: mp 300-302° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 10.16 (br s, 1H), 9.15 (s, 1H), 8.42-8.35 (m, 2H), 7.85 (d, J=7.0 Hz, 1H), 7.65 (d, J=1.5 Hz, 1H), 7.61 (d, J=8.5 Hz, 1H), 7.30 (d, J=2.0 Hz, 1H), 7.13 (dd, J=8.5, 1.5 Hz, 1H), 7.08 (dd, J=7.5, 2.0 Hz, 1H), 4.70 (d, J=12.5 Hz, 1H), 4.32 (dd, J=14.5, 8.0 Hz, 1H), 3.91-3.83 (m, 1H), 3.72 (s, 3H), 3.52-3.43 (m, 1H), 3.41-3.30 (m, 2H), 3.24-3.16 (m, 2H), 1.38 (t, J=7.3 Hz, 3H); ESI MS m/z 453 [M+H]⁺.

Example 121 Preparation of 1-(2-Isopropyl-5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one dihydrochloride

2-Picoline borane (87 mg, 0.81 mmol) was added to a suspension of 1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(5-(trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one dihydrochloride (134 mg, 0.27 mmol) and acetone (0.10 mL, 1.4 mmol) in 9:1 CH₂Cl₂/AcOH (10 mL) under N₂, and the resulting solution was stirred for 24 h. Acetone (1 mL) was added to the solution and the resulting solution was stirred at 25° C. for 24 h. Acetone (1 mL) and 2-picoline borane (87 mg, 0.81 mmol) were added to the solution, and the resulting solution was stirred at reflux for 24 h. The solution was cooled, H₂O was added, and the reaction mixture was neutralized with saturated NaHCO₃ solution. The phases were separated, and the organic phase was dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) afforded 88 mg of a yellow powder. 2N HCl in Et₂O (0.15 mL, 0.330 mmol) was added to a solution of the yellow powder in 1:1 MeOH/CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 30 min. Et₂O was added to the solution, and the resulting solid was collected by filtration under N₂. The solid was washed with Et₂O to afford the title compound (25 mg, 17%) as a yellow powder: ¹H NMR (500 MHz, DMSO-d₆) δ 9.80 (br s, 1H), 9.15 (d, J=2.0 Hz, 1H), 8.42-8.35 (m, 2H), 7.85 (d, J=7.5 Hz, 1H), 7.66 (d, J=1.5 Hz, 1H), 7.62 (d, J=8.5 Hz, 1H), 7.30 (d, J=2.0 Hz, 1H), 7.14 (dd, J=8.5, 1.5 Hz, 1H), 7.08 (dd, J=7.5, 2.0 Hz, 1H), 4.58 (d, J=13.0 Hz, 1H), 4.48-4.40 (m, 1H), 3.90-3.82 (m, 1H), 3.78-3.70 (m, 4H), 3.51-3.42 (m, 1H), 3.38-3.15 (m, 2H), 1.45-1.36 (m, 6H); ESI MS m/z 467 [M+H]⁺.

Example 122 Preparation of 4-(4-Methoxyphenyl)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) 4-(4-Methoxyphenyl)pyridin-2(1H)-one

A suspension of 4-bromo-2-methoxypyridine (1.22 g, 6.49 mmol), 4-methoxyphenyl boronic acid (1.97 g, 13.0 mmol), PdCl₂(dppf) (530 mg, 0.649 mmol) and K₂CO₃ (1.79 g, 13.0 mmol) in DMSO (10 mL) was degassed under reduced pressure for 45 min. The suspension was put under Ar and stirred at 95° C. for 2 h. The suspension was cooled, H₂O was added, and the suspension was filtered to afford a light colored solid. Flash chromatography (silica gel, hexanes/(1:1 EtOAc/hexanes), 100:0 to 0:100) afforded 1.10 g of a white powder. The white powder was diluted with concentrated HCl solution (50 mL) and stirred at reflux for 12 h. The reaction was cooled and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) afforded the title compound (313 mg, 24%) as a white powder: ¹H NMR (300 MHz, DMSO-d₆) δ 11.47 (s, 1H), 7.65 (d, J=8.7 Hz, 2H), 7.38 (d, J=6.8 Hz, 1H), 7.01 (d, J=8.7 Hz, 2H), 6.51 (br s, 1H), 6.47 (d, J=6.8 Hz, 1H), 3.79 (s, 3H).

b) tert-Butyl 7-(4-(4-methoxyphenyl)-2-oxopyridin-1(2H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

A suspension of 4-(4-methoxyphenyl)pyridin-2(1H)-one (103 mg, 0.510 mmol), tert-butyl 7-bromo-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (223 mg, 0.612 mmol), CuI (116 mg, 0.612 mmol), 8-hydroxyquinoline (15 mg, 0.10 mmol) and Cs₂CO₃ (183 mg, 0.561 mmol) in DMSO (10 mL) was degassed under reduced pressure for 45 min. The suspension was put under Ar and stirred at 135° C. overnight. The suspension was cooled, 9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH was added, and the resulting suspension was stirred at 25° C. for 30 min. The suspension was passed through a plug of silica gel, and the filtrate was washed with brine. The resulting solution was dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) afforded the title compound (98 mg, 40%) as a yellow powder: ¹H NMR (300 MHz, CDCl₃) δ 7.64-7.53 (m, 3H), 7.46 (d, J=7.2 Hz, 1H), 7.36 (br s, 1H), 7.08 (dd, J=8.1, 1.5 Hz, 1H), 7.01 (d, J=8.7 Hz, 2H), 6.87 (d, J=1.8 Hz, 1H), 6.51 (dd, J=7.2, 1.8 Hz, 1H), 4.68-4.60 (m, 2H), 3.88 (s, 3H), 3.82-3.73 (m, 2H), 3.65 (s, 3H), 2.85-2.78 (m, 2H), 1.52 (s, 9H).

c) 4-(4-Methoxyphenyl)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

TFA (1 ml) was added to a solution of tert-butyl 7-(4-(4-methoxyphenyl)-2-oxopyridin-1 (2H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (98 mg, 0.20 mmol) in CH₂Cl₂ (10 mL) under N₂ and the resulting solution was stirred for 2.5 h at 25° C. Saturated NaHCO₃ solution was added, and the phases were separated. The organic phase was dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) afforded 49 mg of a white powder. 1N HCl in Et₂O (0.07 mL, 0.07 mmol) was added to a solution of the white powder in CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 1 h. The solution was concentrated under reduced pressure to yield the title compound (47 mg, 55%) as a yellow powder: mp 306-308° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 9.43 (br s, 2H), 7.76 (d, J=9.0 Hz, 2H), 7.70 (d, J=7.0 Hz, 1H), 7.61-7.58 (m, 2H), 7.11-7.05 (m, 3H), 6.73 (d, J=2.0 Hz, 1H), 6.68 (dd, J=7.0, 2.0 Hz, 1H), 4.51-4.45 (m, 2H), 3.83 (s, 3H), 3.70 (s, 3H), 3.48-3.42 (m, 2H), 2.99 (t, J=6.0 Hz, 2H); ESI MS m/z 386 [M+H]⁺.

Example 123 Preparation of 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(4-(methylthio)phenyl)pyridin-2(1H)-one hydrochloride a) 4-(4-(Methylthio)phenyl)pyridin-2(1H)-one

A suspension of 4-bromo-2-methoxypyridine (1.225 g, 6.511 mmol), 4-methylthiophenyl boronic acid (2.188 g, 13.02 mmol), PdCl₂(dppf) (531 mg, 0.651 mmol) and K₂CO₃ (1.797 g, 13.02 mmol) in DMSO (10 mL) was degassed under reduced pressure for 25 min. The suspension was put under N₂ and stirred at 95° C. for 16 h. The suspension was cooled, H₂O was added, and the suspension was filtered to afford a light colored solid. Flash chromatography (silica gel, hexanes/(1:1 EtOAc/hexanes), 100:0 to 0:100) afforded 1.10 g of a white powder. The white powder was diluted with concentrated HCl solution (50 mL) and stirred at reflux for 24 h. The reaction was cooled and concentrated under reduced pressure. The residue was neutralized with saturated NaHCO₃ solution, and the solid was collected by filtration. The solid was washed with H₂O to afford the title compound (1.103 g, 71%) as a tan solid: ¹H NMR (300 MHz, DMSO-d₆) δ 7.65 (d, J=8.4 Hz, 2H), 7.43 (d, J=6.9 Hz, 1H), 7.34 (d, J=8.4 Hz, 2H), 6.57 (d, J=1.7 Hz, 1H), 6.50 (dd, J=6.9, 1.7 Hz, 1H), 3.34 (s, 3H).

b) 1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(4-(methylthio)phenyl)pyridine-2(1H)-one hydrochloride

A suspension of 4-(4-(methylthio)phenyl)pyridine-2(1H)-one (134 mg, 0.615 mmol), tert-butyl 7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (247 mg, 0.676 mmol), CuI (140 mg, 0.738 mmol), 8-hydroxyquinoline (18 mg, 0.12 mmol) and Cs₂CO₃ (220 mg, 0.676 mmol) in DMSO (10 mL) was degassed under reduced pressure for 45 min. The suspension was put under N₂ and stirred at 135° C. overnight. The suspension was cooled, 9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH was added, and the resulting suspension was stirred at 25° C. for 30 min. The suspension was passed through a plug of silica gel, and the filtrate was washed with brine. The resulting solution was dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) afforded 179 mg of a yellow powder. 2N HCl in Et₂O (300 mL) was added to a solution of the yellow powder in 1:1 CH₂Cl₂/MeOH (8 mL) under N₂, and the resulting suspension was stirred at 25° C. for 17 h. The suspension was filtered and the solid was washed with CH₂Cl₂ and 99:1 CH₂Cl₂/MeOH to afford the title compound (41 mg, 15%) as an off-white solid: mp 306-310° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 9.27 (br s, 2H), 7.77-7.71 (m, 3H), 7.61-7.58 (m, 2H), 7.39 (d, J=8.5 Hz, 2H), 7.09 (dd, J=8.5, 2.0 Hz, 1H), 6.78 (d, J=2.0 Hz, 1H), 6.69 (dd, J=7.5, 2.0 Hz, 1H), 4.36 (br s, 2H), 3.70 (s, 3H), 3.56-3.51 (m, 2H), 3.10 (t, J=5.5 Hz, 2H), 2.54 (s, 3H); ESI MS m/z 402 [M+H]⁺.

Example 124 Preparation of 1-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(4-(methylthio)phenyl)pyridine-2(1H)-one hydrochloride a) tert-Butyl 9-methyl-7-(4-(4-(methylthio)phenyl)-2-oxopyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

A suspension of 4-(4-(methylthio)phenyl)pyridine-2(1H)-one (110 mg, 0.505 mmol), tert-butyl 7-bromo-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (203 mg, 0.555 mmol), CuI (115 mg, 0.606 mmol), 8-hydroxyquinoline (15 mg, 0.10 mmol) and Cs₂CO₃ (181 mg, 0.555 mmol) in DMSO (10 mL) was degassed under reduced pressure for 45 min. The suspension was put under N₂ and stirred at 135° C. overnight. The suspension was cooled, 9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH was added, and the resulting suspension was stirred at 25° C. for 30 min. The suspension was passed through a plug of silica gel, and the filtrate was washed with brine. The resulting solution was dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) afforded the title compound (97 mg, 38%) as an off-white powder: ¹H NMR (500 MHz, CDCl₃) δ 7.61-7.54 (m, 3H), 7.48 (d, J=7.5 Hz, 1H), 7.38-7.32 (m, 3H), 7.08 (dd, J=8.5, 2.0 Hz, 1H), 6.89 (d, J=2.0 Hz, 1H), 6.50 (dd, J=7.5, 2.0 Hz, 1H), 4.70-4.61 (m, 2H), 3.81-3.73 (m, 2H), 3.65 (s, 3H), 2.84-2.78 (m, 2H), 2.54 (s, 3H), 1.52 (s, 9H).

b) 1-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(4-(methylthio)phenyl)pyridine-2(1H)-one hydrochloride

TFA (1 ml) was added to a solution of tert-butyl 9-methyl-7-(4-(4-(methylthio)phenyl)-2-oxopyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (97 mg, 0.19 mmol) in CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred for 1.5 h at 25° C. Saturated NaHCO₃ solution was added to the reaction mixture, and the resulting suspension was filtered. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) afforded 35 mg of a yellow powder. 2N HCl in Et₂O (0.09 mL, 0.09 mmol) was added to a solution of the yellow solid in CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 15 min. Et₂O was added to the solution, and the resulting suspension was filtered under N₂. The solid was washed with Et₂O to afford the title compound (37 mg, 17%) as a yellow powder: mp 300-304° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 9.32 (br s, 2H), 7.75 (d, J=8.5 Hz, 2H), 7.73 (d, J=7.3 Hz, 1H), 7.62-7.58 (m, 2H), 7.38 (d, J=8.5 Hz, 2H), 7.10 (dd, J=8.5, 2.0 Hz, 1H), 6.78 (d, J=2.0 Hz, 1H), 6.69 (dd, J=7.3, 2.0 Hz, 1H), 4.49 (br s, 2H), 3.70 (s, 3H), 3.60-3.32 (m, 2H), 2.99 (t, J=5.5 Hz, 2H), 2.54 (s, 3H); ESI MS m/z 402 [M+H]⁺.

Example 125 Preparation of 4-(Benzyloxy)-1-(3,3,9-trimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridine-2(1H)-one hydrochloride a) 4-(1,3-Dioxolan-2-yl)-2-methylbutan-2-amine

Beilstein Registry Number 9387059

This compound was prepared in accordance with the procedure of Hinderaker, et al., Protien Sci. 2003, 12, 1188-1194.

b) tert-Butyl 7-bromo-3,3-dimethyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

A mixture of 4-(1,3-dioxolan-2-yl)-2-methylbutan-2-amine (3.28 g, 20.4 mmol), 3-bromophenylhydrazine hydrochloride (4.34 g, 19.4 mmol) and ZnCl₂ (2.90 g, 21.3 mmol) was stirred at 180° C. for 2.5 h. The mixture was cooled to 120° C., MeOH was added, and the resulting suspension was concentrated on silica gel. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) afforded 4.20 g of a red amorphous solid. Glyoxylic acid (1.87 g, 20.4 mmol) was added to a suspension of the red amorphous solid in 4:2:1 H₂O/MeOH/(concentrated HCl solution) (70 mL), and the resulting solution was stirred at 25° C. for 30 min. The solution was adjusted to pH 3.5 with 6N NaOH in H₂O, and the resulting solution was stirred at 25° C. overnight. The solution was adjusted to pH 5 with saturated NaHCO₃ solution and the suspension was filtered. The solid was diluted with 2N HCl in H₂O, and the resulting suspension was stirred at reflux for 2.5 h. The solution was concentrated under reduced pressure and neutralized with saturated NaHCO₃ solution. The resulting suspension was filtered, and the solid was dissolved in CH₂Cl₂. The resulting solution was dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) afforded 577 mg of a white solid. Boc₂O (2.71 g, 12.4 mmol) was added to a suspension of the white solid and K₂CO₃ (571 mg, 4.14 mmol) in 1:1 H₂O/i-PrOH (40 mL), and the resulting suspension was stirred at 25 C for 5.5 h. The suspension was concentrated under reduced pressure, and the residue was diluted with water. The solid was collected by filtration, and flash chromatography (silica gel, hexanes/(1:1 EtOAc/hexanes), 100:0 to 0:100) afforded the title compound (200 mg, 3%) as a white solid: ¹H NMR (300 MHz, CDCl₃) δ 7.83 (br s, 1H), 7.47 (br s, 1H), 7.31 (br d, J=8.7 Hz, 1H), 7.20 (br d, J=8.7 Hz, 1H), 4.62 (br s, 2H), 2.77 (br s, 2H), 1.53 (s, 6H), 1.48 (s, 9H).

c) tert-Butyl 7-bromo-3,3,9-trimethyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

NaH (60% dispersion in oil, 42 mg, 1.1 mmol) was added to a solution of tert-butyl 7-bromo-3,3-dimethyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (200 mg, 0.528 mmol) in DMF (10 mL) under N₂, and the resulting suspension was stirred at 25° C. for 30 min. MeI (0.05 mL, 0.8 mmol) was added to the suspension, and the resulting suspension was stirred at 25° C. for 1 h. H₂O was added, and the resulting solid was collected by filtration. Flash chromatography (silica gel, hexanes/(1:1 EtOAc/hexanes), 100:0 to 0:100) afforded the title compound (145 mg, 70%) as a white solid: ¹H NMR (300 MHz, CDCl₃) δ 7.43 (d, J=1.5 Hz, 1H), 7.30 (d, J=8.3 Hz, 1H), 7.18 (dd, J=8.3, 1.5 Hz, 1H), 4.62 (s, 2H), 3.61 (s, 3H), 2.77 (s, 2H), 1.52 (s, 6H), 1.49 (s, 9H).

d) 4-(Benzyloxy)-1-(3,3,9-trimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridine-2(1H)-one hydrochloride

A suspension of 4-(benzyloxy)pyridine-2(1H)-one (67 mg, 0.34 mmol), tert-butyl 7-bromo-3,3,9-trimethyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (145 mg, 0.369 mmol), CuI (76 mg, 0.40 mmol), 8-hydroxyquinoline (10 mg, 0.07 mmol) and Cs₂CO₃ (120 mg, 0.369 mmol) in DMSO (10 mL) was degassed under reduced pressure for 45 min. The suspension was put under Ar and stirred at 135° C. overnight. The suspension was cooled, 9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH (10 mL) was added, and the resulting suspension was stirred at 25° C. for 30 min. The suspension was passed through a plug of silica gel, and the filtrate was washed with brine. The resulting solution was dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) afforded 28 mg of a white solid. TFA (1 ml) was added to a solution of the white solid in CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred for 1 h at 25° C. Saturated NaHCO₃ solution was added to the solution, and the phases were separated. The aqueous phase was extracted with CH₂Cl₂, and the combined organic extracts were dried over Na₂SO₄. The resulting solution was concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) afforded 14 mg of a white powder. 2N HCl in Et₂O (0.01 mL, 0.02 mmol) was added to a solution of the white solid in CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 30 min. The solution was concentrated under reduced pressure to afford the title compound (5.2 mg, 3%) as a white powder: mp 184-186° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 9.34 (br s, 2H), 7.57 (d, J=7.5 Hz, 1H), 7.53-7.50 (m, 2H), 7.49-7.41 (m, 4H), 7.40-7.35 (m, 1H), 6.99 (dd, J=8.0, 2.0 Hz, 1H), 6.11 (dd, J=8.0, 2.5 Hz, 1H), 5.98 (d, J=2.5 Hz, 1H), 5.16 (s, 2H), 4.50 (br s, 2H), 3.70 (s, 3H), 2.89 (s, 2H), 1.42 (s, 6H); ESI MS m/z 414 [M+H]⁺.

Example 126 Preparation of 4-(4-Methoxy-2-methylphenyl)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) 4-(4-Methoxy-2-methylphenyl)pyridin-2(1H)-one

A suspension of 4-bromo-2-methoxypyridine (341 mg, 1.82 mmol), 4-methyloxy-2-methylphenyl boronic acid (452 mg, 2.72 mmol), Pd(PPh₃)₂Cl₂ (133 mg, 0.182 mmol) and K₂CO₃ (503 mg, 3.64 mmol) in DMSO (10 mL) was degassed under reduced pressure for 1 h. The suspension was put under Ar and stirred at 90° C. for 2 h. The suspension was cooled, H₂O was added, and the suspension was filtered to afford a light colored solid. Flash chromatography (silica gel, hexanes/(1:1 EtOAc/hexanes), 100:0 to 0:100) afforded 235 mg of a white powder. The white powder was diluted with concentrated HCl solution (20 mL) and stirred at reflux for 24 h. The reaction was cooled and concentrated under reduced pressure. The residue was neutralized with saturated NaHCO₃ solution, and the solid was collected by filtration. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) afforded the title compound (62 mg, 16%) as a white powder: ¹H NMR (300 MHz, DMSO-d₆) δ 11.54 (br s, 1H), 7.35 (d, J=6.9 Hz, 1H), 7.13 (d, J=8.4 Hz, 1H), 6.87-6.76 (m, 2H), 6.15-6.09 (m, 2H), 3.75 (s, 3H), 1.97 (s, 3H).

b) 4-(4-Methoxy-2-methylphenyl)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

A suspension of 4-(4-methoxy-2-methylphenyl)pyridin-2(1H)-one (62 mg, 0.29 mmol), tert-butyl 7-bromo-3,3,9-trimethyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (126 mg, 0.344 mmol), CuI (66 mg, 0.34 mmol), 8-hydroxyquinoline (8 mg, 0.06 mmol) and Cs₂CO₃ (103 mg, 0.316 mmol) in DMSO (10 mL) was degassed under reduced pressure for 45 min. The suspension was put under Ar and stirred at 135° C. overnight. The suspension was cooled, 9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH (10 mL) was added, and the resulting suspension was stirred at 25° C. for 1 h. The suspension was passed through a plug of silica gel, and the filtrate was washed with brine. The resulting solution was dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) afforded 52 mg of a yellow amorphous solid. TFA (1 ml) was added to a solution of the yellow amorphous solid in CH₂Cl₂ (10 mL) under N₂ and the resulting solution was stirred for 1 h at 25° C. Saturated NaHCO₃ solution was added to the solution, and the phases were separated. The aqueous phase was extracted with CH₂Cl₂, and the combined organic extracts were dried over Na₂SO₄. The resulting solution was concentrated under reduced pressure. Flash chromatography (silica gel, (1:1 EtOAc/hexanes)/(9:0.9:0.1 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) afforded 19 mg of a viscous oil. 1N HCl in Et₂O (0.05 mL, 0.05 mmol) was added to a solution of the viscous oil in CH₂Cl₂ (10 mL) under N₂, and the resulting solution was stirred at 25° C. for 30 min. The solution was concentrated under reduced pressure to afford the title compound (16 mg, 13%) as a white powder: mp 308-310° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 9.44 (br s, 2H), 7.67 (d, J=7.0 Hz, 1H), 7.63 (d, J=1.5 Hz, 1H), 7.60 (d, J=8.0 Hz, 1H), 7.25 (d, J=8.5 Hz, 1H), 7.11 (dd, J=8.5, 1.5 Hz, 1H), 6.92 (d, J=2.5 Hz, 1H), 6.88 (dd, J=8.5, 2.5 Hz, 1H), 6.37 (s, 1H), 6.34 (dd, J=7.5, 1.5 Hz, 1H), 4.89 (br s, 2H), 3.79 (s, 3H), 3.70 (s, 3H), 3.49-3.43 (m, 2H), 2.99 (t, J=6.0 Hz, 2H), 2.36 (s, 3H); ESI MS m/z 400 [M+H]⁺.

Example 127 Preparation of 4-(Benzyloxy)-1-(9-methyl-2-(2-(pyrrolidin-1-yl)ethyl)-2,3,4,9,-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridine-2(1H)-one hydrochloride a) 4-(Benzyloxy)-1-(9-methyl-2-(2-(pyrrolidin-1-yl)ethyl)-2,3,4,9,-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridine-2(1H)-one

1-(2-Chloroethyl)pyrrolidine hydrochloride (50 mg, 0.29 mmol) was added to a solution of 4-(benzyloxy)-1-(9-methyl-2,3,4,9,-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridine-2(1H)-one (0.10 g, 0.27 mmol) and diisoproylethyl amine (0.14 mL) in EtOH (4 mL), and the resulting solution was heated at 65° C. for 2 h. The reaction mixture was concentrated to dryness under reduced pressure. Purification by flash column chromatography (40 g ISCO column, CH₂Cl₂/(80:18:2 CH₂Cl₂/MeOH/NH₄OH), 100:0 hold 5 column volumes increased to to 0:100 over 20 column volumes) followed by preparative TLC (Analtech, 20×20 cm, 1000 microns, uV 254, 80:18:2 CH₂Cl₂/MeOH/NH₄OH) followed by preparative HPLC (Phenomenex Luna C18 (2), 250.0×21.2 mm, 10 micron, H₂O with 0.05% TFA and CH₃CN with 0.05% TFA) and filtration through SCX-2 column gave the title compound (10 mg, 7%) as a yellow solid: ¹H NMR (500 MHz, CD₃OD) δ 7.54 (d, J=7.5 Hz, 1H), 7.51 (d, J=8.5 Hz, 1H), 7.46-7.33 (m, 6H), 6.96 (dd, J=8.0, 1.5 Hz, 1H), 6.26 (dd, J=7.5, 2.5, Hz, 1H), 6.11 (d, J=3.0 Hz, 1H), 5.16 (s, 2H), 3.82 (s, 2H), 3.64 (s, 3H), 3.01-2.99 (m, 2H), 2.94-2.85 (m, 10H), 1.91-1.90 (m, 4H); HPLC (Method A) 95.1% (AUC), t_(R)=13.8 min.

b) 4-(Benzyloxy)-1-(9-methyl-2-(2-(pyrrolidin-1-yl)ethyl)-2,3,4,9,-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridine-2(1H)-one hydrochloride

2N HCl in Et₂O (20 μL, 0.04 mmol) was added to a solution of 4-(benzyloxy)-1-(9-methyl-2-(2-(pyrrolidin-1-yl)ethyl)-2, 3,4,9,-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridine-2(1H)-one (10 mg, 0.020 mmol) in CH₂Cl₂ (3 mL) and the reaction was stirred at ambient temperature for 1 h under N₂. The reaction was concentrated to dryness under reduced pressure to provide the title compound (10 mg, quantitative) as a yellow solid: ¹H NMR (500 MHz, CD₃OD) δ 7.62-7.57 (m, 2H), 7.47-7.34 (m, 6H), 7.03 (dd, J=8.5, 1.5 Hz, 1H), 6.29 (dd, J=7.5, 2.5 Hz, 1H), 6.12 (d, J=2.5 Hz, 1H), 5.18 (s, 2H), 4.55-4.43 (m, 2H), 3.72 (s, 3H), 3.38-3.14 (m, 12H), 2.14 (m, 4H); ESI MS m/z 483 [M+H]⁺; HPLC (Method A) 92.8% (AUC), t_(R)=13.6 min.

Example 128 Preparation of 4-(4-Chloro-2-methoxyphenyl)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) tert-Butyl-7-(4-(4-chloro-2-methoxyphenyl)-2-oxopyridin-1 (2H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

tert-Butyl-7-bromo-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (0.19 g, 0.81 mmol), 4-(4-chloro-2-methoxyphenyl)pyridin-2(1H)-one (0.30 g, 0.81 mmol), Cs₂CO₃ (0.29 g, 0.89 mmol) were diluted with DMSO (3.3 mL), and argon was bubbled through the suspension for 10 min. 8-Hydroxyquinoline (59 mg, 0.41 mmol) and copper iodide (0.18 g, 0.97 mmol) were added, and the resulting suspension was placed under vacuum for 15 min. The system was flushed with argon, and the degassing/argon flushing process was repeated a total of three times. The reaction mixture was heated at 130° C. for 18 h and stirred under argon. The suspension was cooled. A solution of 20% NH₄OH in MeOH (40 mL) was added, and the resulting mixture was stirred for 1 h. The mixture was diluted with CH₂Cl₂ and filtered through celite. The filtrate was washed with brine (2×50 mL), dried over Na₂SO₄, and concentrated under reduced pressure. Flash chromatography (40 g ISCO (1:1 hexanes/EtOAc)/(80:18:2 CH₂Cl₂/MeOH/NH₄OH), 100:0 for 3 column volumes then increase to 50:50 over 10 column volumes and hold for 10 column volumes) gave the title compound (0.23 g, 54%) as an olive-green film: ¹H NMR (500 MHz, DMSO-d₆) δ 7.65 (d, J=7.0 Hz, 1H), 7.54 (d, J=2.0 Hz, 1H), 7.50 (d, J=8.0 Hz, 1H), 7.44 (d, J=8.0 Hz, 1H), 7.25 (d, J=1.5 Hz, 1H), 7.13 (dd, J=8.0, 1.5 Hz, 1H), 7.02 (dd, J=8.0, 1.5 Hz, 1H), 6.55 (d, J=2.0 Hz, 1H), 6.54 (dd, J=7.0, 1.5 Hz, 1H), 4.64 (s, 2H), 3.87 (s, 3H), 3.68-3.66 (m, 5H), 2.74-2.72 (m, 2H), 1.46 (s, 9H).

b) 4-(4-Chloro-2-methoxyphenyl)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

Trifluoroacetic acid (1.0 mL) was added to a solution of tert-butyl-7-(4-(4-chloro-2-methoxyphenyl)-2-oxopyridin-1(2H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (0.23 g, 0.44 mmol) in CH₂Cl₂ (2 mL) under argon and stirred for 1 h. The mixture was concentrated under reduced pressure, and the residue was partitioned between CH₂Cl₂ and saturated NaHCO₃ solution. The organic phase was removed, and the aqueous phase was extracted with CH₂Cl₂ (10×25 mL). The combined organic extracts were washed with brine (25 mL), dried over Na₂SO₄, and concentrated under reduced pressure. Flash column chromatography (12 g ISCO CH₂Cl₂/(80:18:2 CH₂Cl₂/MeOH/NH₄OH), 100:0 for 2 column volumes to 0:100 over 20 column volumes and hold for 10 column volumes) provided the free base of the title compound. The free base was converted to the HCl salt using 2N HCl in Et₂O as of Example 129 (step b), providing the title compound (0.13 g, 33%) as a yellow solid: mp 294-300° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 9.43 (br s, 2H), 7.65 (d, J=7.0 Hz, 1H), 7.61 (d, J=1.5 Hz, 1H), 7.59 (d, J=8.0 Hz, 1H), 7.44 (d, J=8.5 Hz, 1H), 7.26 (d, J=2.0 Hz, 1H), 7.13 (dd, J=8.5, 2.0 Hz, 1H), 7.09 (dd, J=8.0, 2.0 Hz, 1H), 6.56 (d, J=2.0 Hz, 1H), 6.47 (dd, J=7.0, 1.5 Hz, 1H), 4.49-4.47 (m, 2H), 3.87 (m, 3H), 3.69 (s, 3H), 3.47-3.43 (m, 2H), 3.00-2.97 (m, 2H); ESI MS m/z 420 [M+H]⁺; HPLC (Method A) 96.7% (AUC), t_(R)=15.5 min.

Example 129 Preparation of 4-(4-Chloro-2-methoxyphenyl)-1-(2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) 4-(4-Chloro-2-methoxyphenyl)-1-(2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one

4-(4-Chloro-2-methoxyphenyl)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one (83 mg, 0.20 mmol) and 37% aqueous formaldehyde (24 μL, 0.30 mmol) were dissolved in 1:1 MeOH/CH₂Cl₂ (1.4 mL) and stirred at room temperature for 45 min. Sodium triacetoxyborohydride (84 mg, 0.40 mmol) was added, and the reaction was stirred at ambient temperature for 30 min. The reaction mixture was neutralized with saturated NaHCO₃ solution and extracted with CH₂Cl₂ (3×25 mL). The combined organics were washed with brine (25 mL), dried over Na₂SO₄, filtered and concentrated to dryness under reduced pressure. Purification by flash column chromatography (12 g ISCO (1:1 hexanes/EtOAc)/(80:18:2 CH₂Cl₂/MeOH/NH₄OH), 95:5 to 10:90 over 20 column volumes, hold for 10 column volumes) provided the title compound (77 mg, 89%) as a yellow film: ¹H NMR (500 MHz, CDCl₃) δ 7.55 (d, J=8.0 Hz, 1H), 7.41 (d, J=7.0 Hz, 1H), 7.35-7.34 (m, 1H), 7.31 (d, J=8.0 Hz, 1H), 7.07-7.03 (m, 2H), 7.00-6.99 (m, 1H), 6.81-6.80 (m, 1H), 6.43-6.42 (m, 1H), 3.87 (s, 3H), 3.66-3.65 (m, 2H), 3.48 (s, 3H), 2.87-2.86 (m, 2H), 2.81-2.80 (m, 2H), 2.58 (s, 3H).

b) 4-(4-Chloro-2-methoxyphenyl)-1-(2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

2N HCl in Et₂O (0.17 mL, 0.34 mmol) was added to a solution of 4-(4-chloro-2-methoxyphenyl)-1-(2,9-dimethyl-2,3,4, 9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one (74 mg, 0.17 mmol) in CH₂Cl₂ (2 mL) and the reaction was stirred at ambient temperature for 1.5 h under N₂. The solids were collected by filtration, washed with Et₂O and dried under reduced pressure to yield the title compound (54 mg, 68%) as a yellow powder: mp 272-280° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 10.82 (br s, 1H), 7.65 (d, J=7.0 Hz, 1H), 7.62 (d, J=1.5 Hz, 1H), 7.60 (d, J=8.5 Hz, 1H), 7.44 (d, J=8.5 Hz, 1H), 7.26 (d, J=1.5 Hz, 1H), 7.14-7.09 (m, 2H), 6.56 (d, J=1.5 Hz, 1H), 6.47 (dd, J=7.0, 1.5 Hz, 1H), 4.79-4.76 (m, 1H), 4.53-4.42 (m, 1H), 3.87 (s, 3H), 3.72-3.68 (m, 4H), 3.42-3.40 (m, 1H), 3.08-3.06 (m, 2H), 3.00 (s, 3H); ESI MS m/z 434 [M+H]⁺; HPLC (Method A) 96.5% (AUC), t_(R)=15.3 min.

Example 130 Preparation of (S)-4-(Benzyloxy)-1-(5-methyl-2-pyrrolidin-2-ylmethyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7yl)pyridine-2(1H)-one hydrochloride a) (S)-tert-Butyl 2-((7-(4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indol-2(5H)-yl)methyl)pyrrolidine-1-carboxylate

A solution of (S)-tert-butyl-2-(bromomethyl)pyrrolidine-1-carboxylate (0.45 g, 1.7 mmol) in DMSO (1.5 mL) was added to a solution of 4-(benzyloxy)-1-(9-methyl-2,3,4,9,-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridine-2(1H)-one (0.33 g, 0.85 mmol), and Cs₂CO₃ (1.10 g, 3.4 mmol) in DMSO (2.8 mL), and the resulting solution was heated at 60° C. for 18 h. The reaction mixture was diluted with H₂O and extracted with CH₂Cl₂ (3×25 mL). The combined organic extracts were washed with brine (2×25 mL), dried over Na₂SO₄ and concentrated to dryness under reduced pressure. Purification by flash column chromatography (40 g ISCO column, CH₂Cl₂/(80:18:2 CH₂Cl₂/MeOH/NH₄OH), 100:0 hold 5 column volumes, increased to 0:100:0 over 20 column volumes) provided a clear film. The film was diluted with EtOAc and washed with brine (4×10 mL), dried over Na₂SO₄, filtered and concentrated under reduced pressure to provide the title compound (19 mg, 3%) as a clear film: ESI MS m/z 569 [M+H]⁺.

b) (S)-4-(Benzyloxy)-1-(5-methyl-2-pyrrolidin-2-ylmethyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7yl)pyridine-2(1H)-one

Trifluoroacetic acid (1.0 mL) was added to a solution of(S)-tert-butyl 2-((7-(4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indol-2(5H)-yl)methyl)pyrrolidine-1-carboxylate (19 mg, 0.033 mmol) in 2:1 CDCl₃/MeOH (1.5 mL) under argon and stirred for 30 min. The mixture was concentrated to dryness under reduced pressure. Flash column chromatography (4 g ISCO CH₂Cl₂/(80:18:2 CH₂Cl₂/MeOH/NH₄OH), 95:5 for 20 column volumes to 0:100 over 40 column volumes and hold for 100 column volumes) yielded the title compound (10 mg, 65%) as a clear film: ESI MS m/z 469 [M+H]⁺

c) (S)-4-(Benzyloxy)-1-(5-methyl-2-pyrrolidin-2-ylmethyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7yl)pyridine-2(1H)-one hydrochloride

2N HCl in Et₂O (0.12 μL, 0.024 mmol) was added to a solution of (S)-4-(benzyloxy)-1-(5-methyl-2-pyrrolidin-2-ylmethyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7yl)pyridine-2(1H)-one) (10 mg, 0.021 mmol) in CH₂Cl₂ (0.6 mL), and the solution was stirred at ambient temperature for 1.5 h under N₂. The reaction mixture was concentrated under reduced pressure to provide the title compound (6.0 mg, 56%) as a white solid: ¹H NMR (500 MHz, CD₃OD) δ 7.59-7.56 (m, 2H), 7.47-7.45 (m, 3H), 7.42-7.39 (m, 2H), 7.37-7.34 (m, 1H), 7.06 (dd, J=8.5, 2.0 Hz, 1H), 6.29 (dd, J=7.5, 2.5 Hz, 1H), 6.12 (d, J=3.0 Hz, 1H), 5.18 (s, 2H), 4.70-4.49 (br m, 2H), 4.28-4.26 (m, 1H), 3.75-3.73 (m, 7H), 3.46-3.43 (m, 2H), 3.34-3.33 (m, 2H), 2.46-2.43 (m, 1H), 2.21-2.08 (m, 2H), 1.91-1.86 (m, 1H); ESI MS m/z 469 [M+H]⁺; HPLC (Method A) 93.8% (AUC), t_(R)=13.5 min.

Example 131 Preparation of 4-(4-Methoxyphenyl)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride c) tert-Butyl 7-(4-(4-methoxyphenyl)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

tert-Butyl-7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (0.19 g, 0.54 mmol), 4-(4-methoxyphenyl)pyridin-2(1H)-one (90 mg, 0.45 mmol) and Cs₂CO₃ (0.16 g, 0.49 mmol) were suspended in DMSO (2.0 mL) and degassed under vacuum for 15 min. The system was then flushed with Ar and 8-hydroxyquinoline (19 mg, 0.13 mmol) and copper iodide (0.10 g, 0.54 mmol) were added. The degassing/Ar flushing process was repeated twice more, and the reaction mixture was heated at 133° C. for 18 h under N₂. The suspension was cooled, diluted with 20% NH₄OH/MeOH (25 mL) and stirred at ambient temperature for 30 min. The suspension was further diluted with CH₂Cl₂ (100 mL). The solution was filtered through silica gel and concentrated under reduced pressure. The concentrate was diluted with CH₂Cl₂ and washed with brine (3×25 mL). The organic phase was dried over Na₂SO₄, filtered and concentrated to dryness. Flash column chromatography (12 g ISCO column, (1:1 hexanes/EtOAc)/(80:18:2 CH₂Cl₂/MeOH/NH₄OH), 100:0 for 10 column volumes, increased to 50:50 over 20 column volumes and then hold for 5 column volumes) gave the title compound (75 mg, 34%) as a yellow solid: ¹H NMR (500 MHz, CDCl₃) δ 7.60 (d, J=9.0 Hz, 2H), 7.53 (d, J=8.0 Hz, 1H), 7.46 (d, J=7.5 Hz, 1H), 7.37 (d, J=1.5 Hz, 1H), 7.08 (d, J=7.5 Hz, 1H), 7.00 (d, J=9.0 Hz, 2H), 6.86 (d, J=2.0 Hz, 1H), 6.50 (dd, J=7.0, 2.0 Hz, 1H), 4.66-4.64 (m, 2H), 3.87 (s, 3H), 3.85-3.84 (m, 2H), 3.64 (s, 3H), 2.84-2.83 (m, 2H), 1.50 (s, 9H).

b) 4-(4-Methoxyphenyl)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one

Trifluoroacetic acid (1.0 mL) was added to a solution of tert-butyl 7-(4-(4-methoxyphenyl)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (74 mg, 0.15 mmol) in CH₂Cl₂ (1 mL) under N₂ and stirred for 2 h at ambient temperature. The mixture was concentrated, and the residue was partitioned between CH₂Cl₂ and saturated NaHCO₃ solution. The organic phase was removed, and the aqueous phase was extracted with CH₂Cl₂ (4×25 mL). The combined organic extracts were washed with brine (25 mL), dried over Na₂SO₄ and concentrated under reduced pressure. Flash column chromatography (12 g ISCO CH₂Cl₂/(80:18:2 CH₂Cl₂/MeOH/NH₄OH), 100:0 for 5 column volumes to 0:100 over 20 column volumes and hold for 5 column volumes) yielded the title compound (46 mg, 78%) as a yellow solid: ¹H NMR (500 MHz, CDCl₃) δ 7.60 (d, J=9.0 Hz, 2H), 7.50-7.46 (m, 2H), 7.36 (d, J=2.0 Hz, 1H), 7.05 (dd, J=8.5, 2.0 Hz, 1H), 7.00 (d, J=8.5 Hz, 2H), 6.86 (d, J=1.5 Hz, 1H), 6.49 (dd, J=7.0, 2.0 Hz, 1H), 4.08 (s, 2H), 3.87 (s, 3H), 3.63 (s, 3H), 3.27 (t, J=6.0 Hz, 2H), 2.77 (t, J=5.5 Hz, 2H).

c) 4-(4-Methoxyphenyl)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

2N HCl in Et₂O (0.12 mL, 0.24 mmol) was added to a solution of 4-(4-methoxyphenyl)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (45 mg, 0.12 mmol) in CH₂Cl₂ (2.0 mL), and the solution was stirred at ambient temperature for 2.5 h under N₂. The reaction mixture was concentrated, partially diluted with H₂O and lyophilized to provide the title compound (46 mg, 95%) as a yellow powder: ¹H NMR (500 MHz, DMSO-d₆) δ 9.26 (br s, 2H), 7.76 (d, J=9.0 Hz, 2H), 7.70 (d, J=7.0 Hz, 1H), 7.60-7.57 (m, 2H), 7.09-7.06 (m, 3H), 6.73 (d, J=2.0 Hz, 1H), 6.68 (dd, J=7.5, 2.0 Hz, 1H), 4.37-4.35 (m, 2H), 3.83 (s, 3H), 3.70 (s, 3H), 3.54-3.53 (m, 2H), 3.10 (t, J=6.0 Hz, 2H); ESI MS m/z 386 [M+H]⁺.

Example 132 Preparation of 4-(4-Methoxy-2-methylphenyl)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) tert-Butyl 7-(4-(4-methoxy-2-methylphenyl)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

tert-Butyl-7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (0.35 g, 0.96 mmol), 4-(4-methoxy-2-methylphenyl)pyridin-2(1H)-one (0.21 g, 0.96 mmol) and Cs₂CO₃ (0.35 g, 1.1 mmol) were suspended in DMSO (5.6 mL), and the resulting suspension was degassed under vacuum for 15 min. The system was then flushed with Ar, and 8-hydroxyquinoline (42 mg, 0.29 mmol) and copper iodide (0.22 g, 1.2 mmol) were added. The evacuation/Ar flushing process was repeated twice more, and the reaction mixture was heated at 130° C. for 18 h under N₂. The suspension was cooled, diluted with 20% NH₄OH/MeOH (10 mL) and stirred at ambient temperature for 30 min. The reaction was further diluted with CH₂Cl₂ (100 mL). The solution was filtered through silica gel and concentrated. The concentrate was diluted with CH₂Cl₂ and washed with brine (4×20 mL). The organic phase was dried over Na₂SO₄ and concentrated to dryness under reduced pressure. Flash column chromatography (12 g ISCO column, (1:1 hexanes/EtOAc)/(80:18:2 CH₂Cl₂/MeOH/NH₄OH), 100:0 for 5 column volumes, increased to 50:50 over 20 column volumes and then hold for 5 column volumes, increase to 0:100 over 10 column volumes and hold for 5 column volumes) gave the title compound (0.25 g, 52%) as a yellow film: ¹H NMR (500 MHz, CDCl₃) δ 7.54 (d, J=8.0 Hz, 1H), 7.42 (d, J=6.5 Hz, 1H), 7.39 (d, J=1.5 Hz, 1H), 7.22 (d, J=8.0 Hz, 1H), 7.10 (d, J=7.0 Hz, 1H), 6.82-6.80 (m, 2H), 6.60 (d, J=1.5 Hz, 1H), 6.24 (dd, J=6.5, 1.5 Hz, 1H), 4.67-4.65 (m, 2H), 3.86-3.83 (m, 5H), 3.65 (s, 3H), 2.93 (m, 3H), 2.82-2.84 (m, 2H), 1.50 (s, 9H).

b) 4-(4-Methoxy-2-methylphenyl)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one

Trifluoroacetic acid (1.0 mL) was added to a solution of tert-butyl 7-(4-(4-methoxy-2-methylphenyl)-2-oxopyridin-1 (2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (0.25 g, 0.50 mmol) in CH₂Cl₂ (2.0 mL) under N₂ and stirred for 1 h. The reaction mixture was made basic with saturated NaHCO₃ solution and the resolution solution was extracted with CH₂Cl₂ (3×25 mL). The combined organic extracts were dried over Na₂SO₄ and concentrated under reduced pressure. Flash column chromatography (12 g ISCO CH₂Cl₂/(80:18:2 CH₂Cl₂/MeOH/NH₄OH), 100:0 for 5 column volumes to 0:100 over 20 column volumes and hold for 40 column volumes) yielded the title compound (0.16 g, 80%) as an off-white film: ¹H NMR (500 MHz, CDCl₃) δ 7.50 (d, J=8.0 Hz, 1H), 7.42 (d, J=7.0 Hz, 1H), 7.38 (m, 1H), 7.22 (d, J=8.0 Hz, 1H), 7.07 (dd, J=8.5, 2.0 Hz, 1H), 6.82-6.80 (m, 2H), 6.60 (d, J=1.5 Hz, 1H), 6.23 (dd, J=7.0, 1.5 Hz, 1H), 4.09 (s, 2H), 3.84 (s, 3H), 3.64 (s, 3H), 2.77 (t, J=5.5 Hz, 2H), 2.27 (t, J=6.0 Hz, 2H), 2.39 (s, 3H).

c) 4-(4-Methoxy-2-methylphenyl)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

2N HCl in Et₂O (0.40 mL, 0.80 mmol) was added to a solution of 4-(4-methoxy-2-methylphenyl)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (0.16 g, 0.40 mmol) in CH₂Cl₂ (1.5 mL), and the solution was stirred at ambient temperature for 1 h under N₂. The solids were collected by filtration, washed with Et₂O and dried to yield the title compound (0.15 g, 85%) as an off-white powder: ¹H NMR (500 MHz, DMSO-d₆) δ 9.39 (br s, 2H), 7.67 (d, J=7.0 Hz, 1H), 7.59 (d, J=8.0 Hz, 1H), 7.27 (d, J=2.0 Hz, 1H), 7.25 (d, J=8.5 Hz, 1H), 7.10 (dd, J=8.5, 2.0 Hz, 1H), 6.92 (d, J=2.5 Hz, 1H), 6.88 (dd, J=8.0, 2.5 Hz, 1H), 6.37 (d, J=2.0 Hz, 1H), 6.34 (dd, J=7.0, 2.0 Hz, 1H), 4.36-4.34 (m, 2H), 3.79 (s, 3H), 3.71 (s, 3H), 3.53-3.52 (m, 2H), 3.10 (t, J=6.0 Hz, 2H), 2.35 (s, 3H); ESI MS m/z 400 [M+H]⁺; HPLC (Method A) 95.8% (AUC), t_(R)=14.5 min.

Example 133 Preparation of (4-Benzyloxy)-1-(9-(difluoromethyl)-2,3,4,9-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) tert-Butyl 7-bromo-9-(difluoromethyl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(9H)-carboxylate

Sodium hydride (60% in mineral oil, 0.347 g, 8.71 mmol) was added to a solution of tert-butyl 7-bromo-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (2.04 g, 5.81 mmol) in DMF (20 mL) at room temperature under N₂ and stirred for 30 minutes. Difluoroiodomethane (˜1.5 mL), which had been condensed with a cold finger into a separate flask, was added via syringe. The reaction was sealed with a rubber septum and stirred overnight at ambient temperature. The mixture was quenched with H₂O. EtOAc was added and the mixture was stirred for 40 minutes. The mixture was extracted with EtOAc (3×40 mL), and the combined organic extracts were washed with brine (2×20 mL), dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (40+M Biotage column, hexanes/(4:1 hexanes/EtOAc), 100:0 to 0:100) provided the title compound (0.93 g, 40%) as a white solid: ¹H NMR (300 MHz, CDCl₃) δ 7.62 (s, 1H), 7.17 (t, J=56.0 Hz, 1H), 7.33 (m, 2H), 4.71 (s, 2H), 3.75 (m, 2H), 2.74 (s, 2H), 1.50 (s, 9H).

b) tert-Butyl 7-(4-benzyloxy)-2-oxopyridin-1(2H)-yl)-9-(difluoromethyl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(9H)-carboxylate

tert-Butyl 7-bromo-9-(difluoromethyl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(9H)-carboxylate (0.936 g, 2.33 mmol), 4-benzyloxypyridone (0.469 g, 2.33 mmol), Cs₂CO₃ (0.834 g, 2.57 mmol) and H₂O (1 drop) were diluted with DMSO (10.4 mL) and argon was bubbled through the suspension for 10 minutes. 8-Hydroxyquinoline (0.101 g, 0.699 mmol) and copper iodide (133 mg, 0.699 mmol) were added, and the resulting suspension was placed under vacuum for 15 min. The system was flushed with argon. The degassing/argon flushing process was repeated a total of three times. The reaction mixture was heated to 130° C. for 18 h and stirred under argon. The suspension was cooled. A solution of 20% NH₄OH in MeOH (40 mL) was added, and the resulting mixture was stirred for 1 h. The mixture was diluted with CH₂Cl₂ and filtered through celite. The filtrate was washed with brine (3×25 mL), dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (40+M Biotage column, (20% EtOAc in hexanes)/(50% EtOAc in hexanes)/(80:18:2 CH₂Cl₂/MeOH/NH₄OH), 100:0:0 to 0:100:0 over 1.2 L then 0:100:0 to 0:0:100 over 1.2 L) gave the title compound (0.41 g, 33%) as a yellow foam: ¹H NMR (500 MHz, DMSO-d₆) δ 8.10 (t, J=58.0 Hz, 1H), 7.74 (d, J=1.4 Hz, 1H), 7.60 (d, J=3.2 Hz, 1H), 7.58 (d, J=3.9 Hz, 1H), 7.47-7.35 (m, 5H), 7.16 (dd, J=8.3, 1.7 Hz, 1H), 6.12 (dd, J=7.6, 2.6 Hz, 1H), 5.99 (d, J=2.7 Hz, 1H), 5.15 (s, 2H), 4.72 (m, 2H), 4.03 (s, 2H), 3.70 (m, 2H), 1.44 (s, 9H).

c) (4-Benzyloxy)-1-(9-(difluoromethyl)-2,3,4,9-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

2N HCl in Et₂O (15.0 mL) was added to a solution of tert-butyl 7-(4-benzyloxy)-2-oxopyridin-1(2H)-yl)-9-(difluoromethyl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(9H)-carboxylate (0.39 g, 0.75 mmol) in 1:1 MeOH/CH₂Cl₂ (5 mL). The reaction was stirred at ambient temperature for 2 h under N₂. The reaction was diluted with Et₂O, and the resulting solids were collected by filtration to yield the title compound (0.31 g, 92%) as a yellow solid: mp 220-230° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 9.60 (br s, 2H), 8.11 (t, J=58.0 Hz, 1H), 7.78 (d, J=1.5 Hz, 1H), 7.68 (d, J=8.0 Hz, 1H), 7.60 (d, J=7.5 Hz, 1H), 7.48-7.36 (m, 5H), 7.22 (dd, J=8.5, 1.5 Hz, 1H), 6.14 (dd, J=7.5, 2.5 Hz, 1H), 5.99 (d, J=2.5 Hz, 1H), 5.16 (s, 2H), 4.52 (m, 2H), 3.49-3.48 (m, 2H), 2.99 (m, 2H); ESI MS m/z 422 [M+H]⁺; HPLC (Method A) 96.5% (AUC), t_(R)=14.4 min

Example 134 Preparation of (4-Benzyloxy)-1-(9-(difluoromethyl)-2-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) (4-Benzyloxy)-1-(9-(difluoromethyl)-2-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one

(4-Benzyloxy)-1-(9-(difluoromethyl)-2,3,4,9-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (83 mg, 20 mmol) and 37% aqueous formaldehyde (22 μL, 0.30 mmol) were dissolved in 1:1 CH₂Cl₂/MeOH (1.0 mL) and stirred at ambient temperature for 45 min. Sodium triacetoxyborohydride (83 mg, 0.39 mmol) was added, and the resulting suspension was stirred at ambient temperature for 15 min. The suspension was concentrated, and the residue was diluted with saturated NaHCO₃ solution. The aqueous solution was extracted with CH₂Cl₂. The combined organic extracts were dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (10 g Biotage SNAP column, CH₂Cl₂/(80:18:2 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100) gave the title compound (57 mg, 67%) as a clear oil. ESI MS m/z 436 [M+H]⁺; HPLC (Method A) 98.9% (AUC), t_(R)=14.3 min.

b) (4-Benzyloxy)-1-(9-(difluoromethyl)-2-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

A solution of (4-benzyloxy)-1-(9-(difluoromethyl)-2-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one (58 mg, 0.13 mmol) in CH₂Cl₂ (1.0 mL) was treated with anhydrous 1.0M HCl in diethyl ether (0.13 mL, 0.13 mmol). The reaction was stirred at ambient temperature for 1 h, and the solids were collected and dried to yield the title compound (53 mg, 86%) as a yellow solid: mp 250-256° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 10.89 (br s, 1H), 8.15 (t, J=58.0 Hz, 1H), 7.82 (d, J=1.5 Hz, 1H), 7.69 (d, J=8.3 Hz, 1H), 7.60 (d, J=7.6 Hz, 1H), 7.47-7.36 (m, 5H), 7.23 (dd, J=8.4, 1.5 Hz, 1H), 6.14 (dd, J=7.6, 2.7 Hz, 1H), 6.00 (d, J=2.7 Hz, 1H), 5.16 (s, 2H), 4.77 (m, 1H), 4.55 (m, 1H), 3.76-3.75 (m, 1H), 3.45-3.40 (m, 1H), 3.07-3.02 (m, 5H); ESI MS m/z 436 [M+H]⁺; HPLC (Method A) 98.9% (AUC), t_(R)=14.4 min.

Example 135 Preparation of 4-(2-Fluoro-4-methoxyphenyl)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) 4-(2-Fluoro-4-methoxyphenyl)-2-methoxypyridine

4-Bromo-2-methoxypyridine (1.39 g, 7.42 mmol), 2-fluoro-4methoxyphenylboronic acid (2.40 g, 14.1 mmol), K₂CO₃ (2.05 g, 14.8 mmol) and bis(triphenylphosphine) palladium(II)chloride (Pd(PPh₃)₂Cl₂) (52 mg, 0.74 mmol) were stirred in DMSO (8.5 mL) under vacuum for 20 min. The flask was flushed with argon and the mixture was heated to 90° C. for 3 h. Upon cooling, the mixture was diluted with brine, and the aqueous solution was extracted with CH₂Cl₂ (3×50 mL). The combined organic extracts were washed with water (3×20 mL), dried over Na₂SO₄ and concentrated under reduced pressure. Flash chromatography (40+M Biotage column, CH₂Cl₂/(80:18:2 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 80:20) provided the title compound (0.98 g, 57%) as a yellow oil: ¹H NMR (500 MHz, CDCl₃) δ 8.20 (d, J=5.4 Hz, 1H), 7.42-7.38 (m, 1H), 7.07 (d, J=5.4 Hz, 1H), 6.93 (s, 1H), 6.80 (dd, J=8.6, 2.5 Hz, 1H), 6.74 (dd, J=12.6, 2.5 Hz, 1H), 3.99 (s, 3H), 3.85 (s, 3H).

b) 4-(2-Fluoro-4-methoxyphenyl)pyridin-2(1H)-one

4-(2-Fluoro-4-methoxyphenyl)-2-methoxypyridine (1.34 g, 5.72 mmol) was stirred in concentrated hydrochloric acid (25.5 mL) at reflux for 18 h. The reaction was cooled to 0° C. and neutralized with solid NaOH. The resulting solids were collected by filtration and dried under vacuum to yield the title compound (1.09 g, 87%) as a light brown solid: ¹H NMR (300 MHz, DMSO-d₆) δ 7.52-7.38 (m, 2H), 6.97-6.85 (m, 2H), 6.42-6.33 (m, 2H), 3.80 (s, 3H); ESI MS m/z 220 [M+H]⁺.

c) tert-Butyl-7(4(2-fluoro-4-methoxyphenyl)-2-oxopyridin-2(1H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

Following the procedure of Example 133 (step b), but substituting 4-(2-fluoro-4-methoxyphenyl)pyridin-2(1H)-one (359 mg, 1.64 mmol) for 4-benzyloxypyridone, the title compound (288 mg, 41%) was prepared as a yellow foam: ¹H NMR (500 MHz, DMSO-d₆) δ 7.71 (d, J=7.1 Hz, 1H), 7.61 (m, 1H), 7.55 (d, J=1.6 Hz, 1H), 7.51 (d, J=8.3 Hz, 1H), 7.04-6.99 (m, 2H), 6.94 (dd, J=6.9, 2.5 Hz, 1H), 6.61 (s, 1H), 6.51-6.50 (m, 1H), 4.64 (s, 2H), 3.84 (s, 3H), 3.69-3.67 (m, 5H), 2.74-2.72 (m, 2H), 1.45 (s, 9H).

d) 4-(2-Fluoro-4-methoxyphenyl)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one

Trifluoroacetic acid (1.0 mL) was added to a solution of tert-butyl-7(4(2-fluoro-4-methoxyphenyl)-2-oxopyridin-2(1H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (0.28 g, 0.56 mmol) in CH₂Cl₂ (5 mL) under argon and stirred for 1 h. The mixture was concentrated, and the residue was partitioned between CH₂Cl₂ and saturated NaHCO₃ solution. The organic phase was removed, and the aqueous phase was extracted with CH₂Cl₂. The combined organic extracts were dried over Na₂SO₄ and concentrated under reduced pressure. Preparative HPLC (Phenomenex Luna C18 (2), 250.0×50.0 mm, 10 micron, H₂O with 0.05% TFA and CH₃CN with 0.05% TFA) provided the title compound (87 mg, 39%) as a yellow solid: ¹H NMR (500 MHz, DMSO-d₆) δ 7.71 (d, J=7.1 Hz, 1H), 7.61 (m, 1H), 7.49-7.46 (m, 2H), 7.02-6.99 (m, 2H), 6.93 (dd, J=8.7, 2.1 Hz, 1H), 6.60 (s, 1H), 6.50 (d, J=7.1 Hz, 1H), 3.96 (m, 2H), 3.84 (s, 3H), 3.61 (s, 3H), 3.01-2.99 (m, 2H), 2.66 (m, 2H); ESI MS m/z 404 [M+H]⁺.

e) 4-(2-Fluoro-4-methoxyphenyl)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

A solution of 4-(2-fluoro-4-methoxyphenyl)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one (80 mg, 0.20 mmol) in CH₂Cl₂ (2.6 mL) was treated with anhydrous 1.0M HCl in diethyl ether (0.22 mL, 0.22 mmol). The reaction was stirred at ambient temperature for 1 h, and then the solids were collected by filtration and dried to yield the title compound (68 mg, 77%) as a yellow solid: mp 290-292° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 9.54 (s, 2H), 7.71 (d, J=7.2 Hz, 1H), 7.62-7.58 (m, 3H), 7.10 (dd, J=8.3, 1.8 Hz, 1H), 7.01 (dd, J=13.2, 2.4 Hz, 1H), 6.94 (dd, J=8.6, 2.3 Hz, 1H), 6.62 (s, 1H), 6.53-6.52 (m, 1H), 4.48 (s, 2H), 3.95 (s, 3H), 3.69 (s, 3H), 3.45-3.44 (m, 2H), 3.00-2.97 (m, 2H); ESI MS m/z 404 [M+H]⁺; HPLC (Method A) >99% (AUC), t_(R)=14.6 min.

Example 136 Preparation of 1-(2,9-Dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(2-fluoro-4-methoxyphenyl)pyridin-2(1H)-one hydrochloride a) 1-(2,9-Dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(2-fluoro-4-methoxyphenyl)pyridin-2(1H)-one

Following the procedure of Example 134 (step a), but substituting 4-(2-fluoro-4-methoxyphenyl)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one (57 mg, 0.14 mmol) for (4-benzyloxy)-1-(9-(difluoromethyl)-2,3,4,9-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one, the title compound (35 mg, 59%) was provided as an off-white solid: ¹H NMR (500 MHz, DMSO-d₆) δ 7.71 (d, J=7.0 Hz, 1H), 7.61 (m, 1H), 7.51 (d, J=1.8 Hz, 1H), 7.48 (d, J=8.3 Hz, 1H), 7.02-6.99 (m, 2H), 6.94 (dd, J=8.6, 2.4 Hz, 1H), 6.60 (s, 1H), 6.53-6.52 (m, 1H), 3.84 (s, 3H), 3.62 (m, 5H), 2.74-2.70 (m, 4H), 2.46 (s, 3H).

b) 1-(2,9-Dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(2-fluoro-4-ethoxyphenyl)pyridin-2(1H)-one hydrochloride

Following the procedure of Example 134 (step b), but substituting 1-(2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(2-fluoro-4-methoxyphenyl)pyridin-2(1H)-one (35 mg, 0.84 mmol) for (4-benzyloxy)-1-(9-(difluoromethyl)-2-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one, the title compound (33 mg, 87%) was provided as a yellow solid: mp 290-294° C.; ¹H NMR (500 MHz, DMSO-d₆) δ 10.71 (s, 1H), 7.71 (d, J=7.2 Hz, 1H), 7.63-7.59 (m, 3H), 7.11 (dd, J=8.3, 1.6 Hz, 1H), 7.01 (dd, J=13.2, 2.4 Hz, 1H), 6.94 (dd, J=8.7, 2.4 Hz, 1H), 6.62 (s, 1H), 6.53-6.52 (m, 1H), 4.80-4.77 (m, 1H), 4.45-4.43 (m, 1H), 3.84 (s, 3H), 3.73 (br s, 1H), 3.68 (s, 3H), 3.42-3.34 (m, 1H), 3.07-3.06 (m, 2H), 3.00 (s, 3H); ESI MS m/z 418 [M+H]⁺; HPLC (Method A) 97.0% (AUC), t_(R)=14.0 min.

Example 137 Preparation of 4-(Imidazo[1,2-a]pyridin-2-ylmethoxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) 4-(Imidazo[1,2-a]pyridin-2-ylmethoxy)pyridine 1-oxide

Imidazo[1,2-a]pyridine-2-ylmethanol (3.01 g, 20.3 mmol) was partially dissolved in 5:1 dioxane/DMF (30 mL) and the resulting slurry was added slowly to a stirring suspension of NaH (60% in mineral oil, 0.812 g, 16.9 mmol) in dioxane (29 mL). The resulting mixture was heated to 60° C. for 15 min. 4-Chloropyridine-N-oxide (1.5 g, 11.5 mmol) was added and the reaction mixture was heated for 1 h at 110° C. Upon cooling, the mixture was diluted with methylene chloride and a 20% NH₄OH in MeOH solution. The resulting suspension was filtered through a silica gel plug using CH₂Cl₂ (200 mL) and 20% 4:1 MeOH/NH₄OH in CH₂Cl₂ (500 mL). The filtrate was collected and concentrated under reduced pressure. Flash chromatography (120 g ISCO column, CH₂Cl₂/(80:18:2 CH₂Cl₂/MeOH/NH₄OH), 100:0 to 0:100 over 60 min) provided the title compound (1.5 g, 30%) as an orange-brown solid: ¹H NMR (300 MHz, CD₃OD) δ 8.42 (m, 1H), 8.24-8.22 (m, 2H), 7.97 (d, J=0.5 Hz, 1H), 7.54 (dd, J=9.1, 0.7 Hz, 1H) 7.37-7.32 (m, 1H), 7.27-7.25 (m, 2H), 6.94 (m, 1H), 5.37 (s, 2H).

b) 4-(Imidazo[1,2-a]pyridin-2-ylmethoxy)pyridine-2(1H)-one

4-(Imidazo[1,2-a]pyridin-2-ylmethoxy)pyridine 1-oxide (1.50 g, 6.25 mmol) was heated at 140° C. in acetic anhydride (18 mL) for 2 h. The mixture was concentrated and heated at 80° C. for 2 h in 1:1 MeOH/H₂O (50 mL). The resulting black solution was concentrated. The material was then partially dissolved in iPrOH (20 mL). Et₂O (70 mL) was added, and the mixture was allowed to sit at ambient temperature for 1 h. The resulting solids were collected by filtration and washed with Et₂O to yield the title compound (951 mg, 63%) as a dark brown solid: ¹H NMR (300 MHz, DMSO-d₆) δ 11.08 (br s, 1H), 8.54 (m, 1H), 8.01 (s, 1H), 7.53 (d, J=9.0 Hz, 1H), 7.26-7.23 (m, 2H), 6.90 (m, 1H), 5.89-5.87 (m, 2H), 5.14 (s, 2H).

c) tert-Butyl-7-(4-(imidazo[1,2-a]pyridin-2-ylmethoxy)-2-oxopyridin-1(2H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

tert-Butyl-7-bromo-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (0.328 g, 0.898 mmol), 4-(imidazo[1,2-a]pyridin-2-ylmethoxy)pyridine-2(1H)-one (0.240 g, 0.998 mmol) and Cs₂CO₃ (0.358 g, 1.09 mmol) were suspended in DMSO (4.0 mL), and argon was bubbled through the system for 10 minutes. 8-Hydroxyquinoline (43.4 mg, 0.299 mmol) and copper iodide (228 mg, 1.20 mmol) were added, and resulting suspension was placed under vacuum for 15 min. The system was flushed with argon. The evacuation/argon flushing process was repeated a total of three times. The reaction mixture was heated at 130° C. for 18 h under argon. The mixture was cooled, and a solution of 20% NH₄OH in MeOH (40 mL) was added. The resulting mixture was stirred for 1 h. The mixture was diluted with CH₂Cl₂ and filtered through a silica gel plug. The filtrate was collected and concentrated. The residue was diluted with CH₂Cl₂, washed with brine (3×25 mL), dried over Na₂SO₄ and concentrated under reduced pressure. Purification by flash column chromatography (80 g ISCO column, (1:1 hexanes/EtOAc)/(80:18:2 CH₂Cl₂/MeOH/NH₄OH), 80:20 to 0:100:0 over 10 column volumes and then hold for 8 column volumes) gave the title compound (0.190 g, 40%) as a yellow foam: ¹H NMR (500 MHz, DMSO-d₆) δ 8.12 (d, J=6.8 Hz, 1H), 7.69 (s, 1H), 7.61 (d, J=9.1 Hz, 1H), 7.52 (d, J=8.3 Hz, 1H), 7.31-7.29 (m, 2H), 7.22-7.19 (m, 1H), 7.02 (dd, J=8.3, 1.7 Hz, 1H), 6.83-6.80 (m, 1H), 6.17 (d, J=2.7 Hz, 1H), 6.07 (dd, J=7.6, 2.7 Hz, 1H), 5.25 (s, 2H), 4.64 (m, 2H), 3.75 (m, 2H), 3.63 (s, 3H), 2.80 (m, 2H), 1.52 (s, 9H), ESI MS m/z 526 [M+H]⁺

d) 4-(Imidazo[1,2-a]pyridin-2-ylmethoxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one

Following the procedure of Example 135 (step d), but substituting tert-butyl-7-(4-(imidazo[1,2-a]pyridin-2-ylmethoxy)-2-oxopyridin-1(2H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (190 mg, 362 mmol) for tert-butyl-7(4(2-fluoro-4-methoxyphenyl)-2-oxopyridin-2(1H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate, the title compound (0.105 g, 68%) was prepared as a yellow film: ¹H NMR (500 MHz, CD₃OD) δ 8.45-8.43 (m, 1H), 7.98 (s, 1H), 7.59-7.54 (m, 3H), 7.41 (d, J=1.8 Hz, 1H), 7.37-7.33 (m, 1H), 7.02 (dd, J=8.3, 1.8 Hz, 1H), 6.96-6.94 (m, 1H), 6.29 (dd, J=7.6, 2.7 Hz, 1H), 6.21 (d, J=2.7 Hz, 1H), 5.31 (s, 2H), 3.96 (s, 2H), 3.68 (s, 3H), 3.42 (t, J=6.0 Hz, 2H), 3.00 (t, J=6.0 Hz, 2H); ESI MS m/z 426 [M+H]⁺.

e) 4-(Imidazo[1,2-a]pyridin-2-ylmethoxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one-hydrochloride

Following the procedure of Example 134 (step b), but substituting 4-(imidazo[1,2-a]pyridin-2-ylmethoxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one (102 mg, 0.240 mmol) for (4-benzyloxy)-1-(9-(difluoromethyl)-2-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one, the title compound (95 mg, 86%) was prepared as a yellow solid: ¹H NMR (500 MHz, CD₃OD) δ 8.81 (d, J=7.0, 1.0 Hz, 1H), 8.38 (s, 1H), 8.02-7.99 (m, 1H), 7.92 (d, J=9.5 Hz, 1H), 7.66-7.62 (m, 2H), 7.52-7.49 (m, 1H), 7.46 (s, 1H), 7.05 (d, J=7.0 Hz, 1H), 6.33 (dd, J=7.5, 3.0 Hz, 1H), 6.23 (d, J=3.0 Hz, 1H), 5.50 (s, 2H), 4.55 (s, 2H), 3.72 (s, 3H), 3.60 (t, J=6.0 Hz, 2H), 3.14-3.12 (m, 2H); ESI MS m/z 426 [M+H]⁺; HPLC (Method A) 98.5% (AUC), t_(R)=9.2 min.

Example 138 Preparation of 1-(2,9-Dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(imidazo[1,2-a]pyridin-2-ylmethoxy)pyridin-2(1H)-one hydrochloride a) 1-(2,9-Dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(imidazo[1,2-a]pyridin-2-ylmethoxy)pyridin-2(1H)-one

Following the procedure of Example 134 (step a), but substituting 4-(imidazo[1,2-a]pyridin-2-ylmethoxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one (57 mg, 0.14 mmol) for (4-benzyloxy)-1-(9-(difluoromethyl)-2,3,4,9-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one, the title compound (25 mg, 62%) was prepared as a yellow solid: ¹H NMR (500 MHz, DMSO-d₆) δ 7.54 (d, J=7.5 Hz, 1H), 7.47-7.36 (m, 7H), 6.95 (dd, J=8.5, 1.5 Hz, 1H), 6.10 (dd, J=7.5, 2.5 Hz, 1H), 5.96 (d, J=3.0 Hz, 1H), 5.15 (s, 2H), 3.64 (m, 4H), 3.18-3.16 (m, 1H), 3.05-3.02 (m, 1H), 2.90-2.84 (m, 4H), 2.42-2.39 (m, 1H), 2.00-1.92 (m, 1H).

b) 1-(2,9-Dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(imidazo[1,2-a]pyridin-2-ylmethoxy)pyridin-2(1H)-one hydrochloride

Following the procedure of Example 134 (step b), but substituting 1-(2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(imidazo[1,2-a]pyridin-2-ylmethoxy)pyridin-2(1H)-one (25 mg, 0.056 mmol) for (4-benzyloxy)-1-(9-(difluoromethyl)-2-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one, the title compound (27 mg, 98%) was prepared as a yellow solid: ¹H NMR (500 MHz, DMSO-d₆) δ 10.91 (br s, 1H), 8.86 (d, J=6.0 Hz, 1H), 8.39 (s, 1H), 7.87-7.79 (m, 2H), 7.61 (d, J=7.5 Hz, 1H), 7.57 (d, J=8.0 Hz, 1H), 7.51 (s, 1H), 7.37-7.35 (m, 1H), 7.01 (dd, J=8.5, 1.0 Hz, 1H), 6.15-6.11 (m, 2H), 5.42 (s, 2H), 4.77 (d, J=15.0 Hz, 1H), 4.43 (dd, J=14.0, 6.0 Hz, 1H), 3.80-3.77 (m, 1H), 3.66 (s, 3H), 3.41-3.39 (m, 1H), 3.08-3.04 (m, 2H), 2.99 (s, 3H); ESI MS m/z 440 [M+H]⁺; HPLC (Method A) 97.1% (AUC), t_(R)=9.8 min.

Example 139 Preparation of 1-(2,9-Dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)-4-(4-(trifluoromethyl)benzyloxy)pyridin-2(1H)-one hydrochloride a) 4-(Imidazo[1,2-a]pyridin-6-ylmethoxy)pyridine 1-oxide

Following the procedure of Example 137 (step a), but substituting imidazo[1,2-a]pyridine-6-ylmethanol (2.91 g, 19.6 mmol) for imidazo[1,2-a]pyridine-2-ylmethanol, the title compound (1.69 g, 42%) was prepared as an orange solid: ¹H NMR (300 MHz, DMSO-d₆) δ 8.70 (s, 1H), 8.13-8.10 (m, 2H), 7.97 (s, 1H), 7.60-7.59 (m, 2H), 7.30 (dd, J=9.3, 1.7 Hz, 1H), 7.14-7.11 (m, 2H), 5.18 (s, 2H).

b) 4-(Imidazo[1,2-a]pyridin-6-ylmethoxy)pyridine-2(1H)-one

4-(Imidazo[1,2-a]pyridin-6-ylmethoxy)pyridine 1-oxide (1.69 g, 7.04 mmol) was heated at 140° C. in acetic anhydride (20 mL) for 4 h. The mixture was concentrated and heated at 80° C. for 3 h in a mixture of 1:1 MeOH/H₂O (50 mL). The resulting solution was concentrated. The residue was partially dissolved in iPrOH (75 mL). Et₂O (200 mL) was added, and the mixture was allowed to sit at ambient temperature for 1 h. The resulting solids were collected by filtration, washed with Et₂O and dried under reduced pressure. The solids were again subjected to iPrOH and Et₂O, and the solids were removed by filtration. The filtrate was concentrated to afford the title compound (0.47 g, 28%) as a dark brown solid: ¹H NMR (300 MHz, CD₃OD) δ 8.60 (d, J=0.7 Hz, 1H), 7.87 (d, J=0.6 Hz, 1H), 7.59 (d, J=1.4 Hz, 1H), 7.57 (s, 1H), 7.40-7.27 (m, 2H), 6.18 (dd, J=7.3, 2.5 Hz, 1H), 6.05 (d, J=2.5 Hz, 1H), 5.13 (s, 2H).

c) tert-Butyl-7-(4-(imidazo[1,2-a]pyridin-6-ylmethoxy)-2-oxopyridin-1 (2H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

Following the procedure of Example 133 (step b), but substituting 4-(imidazo[1,2-a]pyridin-6-ylmethoxy)pyridine-2(1H)-one (218 mg, 0.901 mmol) for 4-benzyloxypyridone, the title compound (112 mg, 26%) was prepared as a yellow solid: ¹H NMR (500 MHz, CDCl₃) δ 8.25 (s, 1H), 7.68-7.65 (m, 2H), 7.64-7.61 (m, 1H), 7.53-7.52 (m, 1H), 7.33 (d, J=7.6 Hz, 1H), 7.28-7.26 (m, 1H), 7.22 (dd, J=9.3, 1.5 Hz, 1H), 7.01 (dd, J=8.2, 1.8 Hz, 1H), 6.11 (d, J=2.7 Hz, 1H), 6.03 (dd, J=7.5, 2.7 Hz, 1H), 5.06-5.04 (m, 2H), 4.70-4.57 (m, 2H), 3.75 (m, 2H), 3.62 (s, 3H), 2.79 (m, 2H), 1.51 (s, 9H).

d) 4-(Imidazo[1,2-a]pyridin-6-ylmethoxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

Following the procedure of Example 135 (step d), but substituting tert-butyl-7-(4-(imidazo[1,2-a]pyridin-6-ylmethoxy)-2-oxopyridin-1 (2H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (112 mg, 0.213 mmol) for tert-butyl-7(4(2-fluoro-4-methoxyphenyl)-2-oxopyridin-2(1H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate, the crude title compound was prepared. Preparative HPLC (Phenomenex Luna C18 (2), 250.0×21.2 mm, 10 micron, H₂O with 0.05% TFA and CH₃CN with 0.05% TFA) yielded the title compound (12 mg, 13%) as an off-white film: ¹H NMR (500 MHz, CDCl₃) δ 8.24 (s, 1H), 7.67-7.65 (m, 2H), 7.59 (s, 1H), 7.53 (d, J=8.3 Hz, 1H), 7.34 (d, J=7.6 Hz, 1H), 7.26 (m, 1H overlapping with solvent), 7.22 (dd, J=9.3, 1.6 Hz, 1H), 7.00 (dd, J=8.3, 1.8 Hz, 1H), 6.11 (d, J=2.7 Hz, 1H), 6.03 (dd, J=7.6, 2.7 Hz, 1H), 5.04 (s, 2H), 4.04 (s, 2H), 3.57 (s, 3H), 3.17 (t, J=5.6 Hz, 2H), 2.76 (t, J=5.6 Hz, 2H).

e) 4-(Imidazo[1,2-a]pyridin-6-ylmethoxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

Following the procedure of Example 134 (step b), but substituting 4-(imidazo[1,2-a]pyridin-6-ylmethoxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one (12 mg, 0.028 mmol) for (4-benzyloxy)-1-(9-(difluoromethyl)-2-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one, the title compound (14 mg, 100%) was prepared as a light yellow solid: ¹H NMR (500 MHz, DMSO-d₆) δ 9.55 (br s, 2H), 9.01 (s, 1H), 8.33 (s, 1H), 8.11 (s, 1H), 7.97 (d, J=9.2 Hz, 1H), 7.89 (d, J=9.2 Hz, 1H), 7.61 (d, J=7.6 Hz, 1H), 7.56 (d, J=8.4 Hz, 1H), 7.50 (d, J=1.6 Hz, 1H), 7.00 (dd, J=8.4, 1.7 Hz, 1H), 6.13 (dd, J=7.6, 2.7 Hz, 1H), 6.08 (d, J=2.7 Hz, 1H), 5.31 (s, 2H), 4.46 (m, 2H), 3.67 (s, 3H), 3.44 (m, 2H), 2.97 (t, J=5.7 Hz, 2H); ESI MS m/z 426 [M+H]⁺; HPLC (Method A) >99% (AUC), t_(R)=9.7 min.

Example 140 Preparation of 4-(Benzyloxy)-1-(8-fluoro-2,5-dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) (3-Bromo-4-fluorophenyl)hydrazine hydrochloride

A solution of sodium nitrite (4.2 g, 60 mmol) was added drop-wise to a mixture of 3-bromo-4-fluoroaniline (11.2 g, 58.9 mmol) and concentrated HCl (30 mL, 0.36M) at 0° C. over 30 min. The resulting clear solution was stirred for 45 min, and a solution of SnCl₂.2H₂O (27 g, 120 mmol) in concentrated HCl (30 mL) was added drop-wise at 0° C. over 1.5 h. The mixture was stirred for 18 h at room temperature. The resulting precipitate was collected by filtration and crystallized from ethanol to provide the title compound (6.2 g, 42%) as a yellow powder: ¹H NMR (300 MHz, DMSO-d₆) δ 10.24 (s, 3H), 8.42 (s, 1H), 7.36-7.30 (m, 2H), 7.03-6.98 (m, 1H).

b) 7-Bromo-8-fluoro-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

A mixture of (3-bromo-4-fluorophenyl)hydrazine hydrochloride (3.0 g, 12 mmol), tert-butyl 4-oxopiperidine-1-carboxylate (2.48 g, 12.5 mmol) and concentrated HCl (6.0 mL, 72 mmol) in ethanol (40 mL) was stirred for 18 h at reflux. The solvent was removed under reduced pressure, the residue was suspended in dichloromethane (50 mL), and di-tert-butyl dicarbonate (3.3 g, 15 mmol) and triethylamine (2.1 mL, 30 mmol) were added. The mixture was stirred for 18 h at ambient temperature. The resulting clear solution was concentrated, and the residue was purified by flash chromatography (silica gel, hexanes/ethyl acetate, 1:0 to 1:1) to afford the title compound (0.9 g, 20%) as a yellow solid: ¹H NMR (500 MHz, CDCl₃) δ 7.94 (br s, 1H), 7.45 (d, J=5.5 Hz, 1H), 7.14 (br s, 1H), 4.56 (br s 2H), 3.81 (br m 2H), 2.81 (br m 2H), 1.57 (s, 9H); ESI MS m/z 369 [M+H]⁺.

c) tert-Butyl 7-bromo-8-fluoro-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

Sodium hydride (60% weight dispersion in mineral oil, 150 mg, 3.66 mmol) was added to a solution of tert-butyl 7-bromo-8-fluoro-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (0.9 g, 2.44 mmol) in 20 ml of DMF, and the mixture was stirred for 40 min at ambient temperature. Iodomethane (0.25 mL, 3.66 mmol) was added, and the resulting suspension was stirred for 2 h. The resulting mixture was concentrated under reduced pressure to ˜⅓ of initial volume and treated with water (20 mL). The resulting precipitate was collected by filtration, sequentially washed with water and diethyl ether and dried under vacuum to afford the title compound (0.75 g, 83%) as a yellow solid: ¹H NMR (300 MHz, CDCl₃) δ 7.42 (d, J=5.4 Hz, 1H), 7.17 (d, J=9.3 Hz, 1H), 4.45 (br s, 2H), 3.81 (br m, 2H), 3.60 (s, 3H), 2.78 (br m, 2H), 1.52 (s, 9H); ESI MS m/z 383 [M+H]⁺.

d) 4-(Benzyloxy)-1-(8-fluoro-5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one

tert-Butyl 7-bromo-8-fluoro-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (720 mg, 1.88 mmol), 4-benzyloxypyridone (380 mg, 1.9 mmol) and Cs₂CO₃ (680 mg, 2.1 mmol) were suspended in DMSO (8.0 mL) and the resulting suspension was degassed for 15 min. The system was flushed with Ar. Then 8-hydroxyquinoline (87 mg, 0.60 mmol) and copper iodide (114 mg, 0.599 mmol) were added. The degassing/Ar flushing process was repeated twice more, and the reaction mixture was heated at 133° C. for 18 h under argon. The reaction mixture was cooled, diluted with 15% solution of concentrated ammonium hydroxide in methanol (25 mL) and stirred at ambient temperature for 30 min. The reaction was further diluted with dichloromethane (75 mL). The solution was filtered through silica gel and concentrated under reduced pressure. The residue was diluted with CH₂Cl₂ and washed with H₂O (25 mL) and brine (3×50 mL). The combined organics were dried over Na₂SO₄ and concentrated to dryness. The crude material was purified by flash chromatography (silica gel, (1:1 hexanes/EtOAc)/(10:1:0.1 dichloromethane/methanol/concentrated ammonium hydroxide), 1:0 to 0:1) to afford crude tert-butyl 7-(4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-8-fluoro-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (280 mg) as a yellow oil. This oil was dissolved in dichloromethane (3 mL) and TFA (1 mL) was added. The reaction mixture was stirred at ambient temperature for 1 h, concentrated and dried under vacuum overnight to provide the title compound (200 mg), which was used in the next step without further purification: ESI MS m/z 404 [M+H]⁺.

e) 4-(Benzyloxy)-1-(8-fluoro-2,5-dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

To a solution of 4-(benzyloxy)-1-(8-fluoro-5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (100 mg, 0.26 mmol) in dichloromethane/acetic acid (1% acetic acid, 10 mL) were sequentially added formaldehyde (37% aqueous solution, 22 μL, 0.74 mmol) and NaBH(OAc)₃ (316 mg, 1.49 mmol). The reaction mixture was stirred at room temperature for 2.5 h. The mixture was concentrated under reduced pressure, and the residue was dissolved in CH₂Cl₂. The organic layer was washed with H₂O and 5% aqueous LiCl, dried over Na₂SO₄, filtered and concentrated. Purification by flash chromatography (silica gel, CH₂Cl₂/(10:1:0.1 CH₂Cl₂/MeOH/NH₄OH), 0:1 to 1:1) gave 4-(benzyloxy)-1-(8-fluoro-2,5-dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (78 mg, 38%) as a yellow solid. The free base was converted to the HCl salt using 1.25M HCl in methanol providing the title compound (75 mg, 95%) as a off-white solid: ¹H NMR (300 MHz, CD₃OD) δ 7.53-7.33 (m, 7H), 7.27 (d, J=10.5 Hz, 1H), 7.28 (dd, J=7.8, 2.4 Hz, 1H), 6.10 (d, J=2.7 Hz, 1H), 5.17 (s, 2H), 3.79 (br s, 2H), 3.67 (s, 3H), 3.03-3.00 (m, 4H), 2.64 (s, 3H); ESI MS m/z 418 [M+H]⁺; HPLC (Method A) 95.7% (AUC), t_(R)=14.5 min.

Example 141 Preparation of 4-(Benzyloxy)-1-(6-fluoro-9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride a) 2-(6-Bromo-5-fluoro-1H-indol-3-yl)ethanamine

4,4-Diethoxybutan-1-amine (4.72 g, 29.3 mmol) was added to (3-bromo-4-fluorophenyl)hydrazine hydrochloride (6.4 g, 27 mmol). The resulting mixture in an open round bottom flask was placed into a preheated oil bath at 180° C. The mixture was stirred at 180° C. for 2.5 h and then cooled to 120° C. Methanol (300 mL) was added, and the mixture was stirred at ambient temperature for 18 h. The resulting suspension was filtered through a silica gel plug, and the silica gel was then washed with methanol (5×300 mL). The combined methanol fractions were concentrated under vacuum to provide the crude title compound (8.1 g) as a yellow solid, which was used in the next step without further purification: ESI MS m/z 257 [M+H]⁺.

b) tert-Butyl 7-bromo-6-fluoro-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

Glyoxylic acid (8.6 g, 95 mmol) was added to a solution of 2-(6-bromo-5-fluoro-1H-indol-3-yl)ethanamine (8.1 g 31 mmol) in 2N HCl (150 ml), and the pH of the resulting solution was adjusted to pH 3.5 with 6N NaOH solution. The reaction mixture was stirred at ambient temperature for 18 h. The solution was adjusted to pH 5.5 with 6N NaOH solution. The resulting precipitate was collected by filtration and dried under vacuum to afford a yellow solid. The yellow solid was suspended in 2N HCl (100 mL), and the resulting mixture was stirred at reflux for 4.5 h. The reaction mixture was cooled to ambient temperature and was adjusted to pH 10 by addition of 2N sodium hydroxide solution. The resulting precipitate was collected by filtration and dried under vacuum to afford a crude mixture of 7-bromo-6-fluoro-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole and 6-bromo-7-fluoro-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indole (2.0 g, 23%) as a yellow solid. The mixture (1.9 g, 7.1 mmol) was suspended in dichloromethane (100 mL) and di-tert-butyl carbonate (1.85 g, 8.7 mmol) was added, followed by addition of DMAP (100 mg, 0.82 mmol). The reaction mixture was stirred at ambient temperature for 18 h and concentrated under vacuum. The residue was purified twice by column chromatography (silica gel, hexanes/ethyl acetate, 0:1 to 1:1) to afford the title compound (300 mg, 12%) as a pale yellow solid: ¹H NMR (300 MHz, CDCl₃) δ 7.46 (d, J=5.7 Hz, 1H), 7.18 (d, J=9.0 Hz, 1H), 4.61 (s, 2H), 3.75 (br m, 2H), 2.73 (br m, 2H), 1.56 (s, 9H); ESI MS m/z 369 [M+H]⁺.

c) tert-Butyl 7-bromo-6-fluoro-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

Sodium hydride (60% weight dispersion in mineral oil, 25 mg, 0.60 mmol) was added to a solution of tert-butyl 7-bromo-6-fluoro-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (150 mg, 0.40 mmol) in DMF (10 mL) at room temperature under N₂ and stirred for 1 h at ambient temperature. Methyl iodide (230 mg, 0.16 mL, 0.60 mmol) was added, and the reaction mixture was stirred for 1 h. The resulting mixture was concentrated under reduced pressure to approximately ⅓ of initial volume and treated with water (20 mL). The resulting precipitate was collected by filtration, washed with water and diethyl ether and dried under vacuum to afford the title compound (140 mg, 91%) as a yellow powder: ESI MS m/z 383 [M+H]⁺.

d) 4-(Benzyloxy)-1-(6-fluoro-9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

tert-Butyl 7-bromo-6-fluoro-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate (160 mg, 0.40 mmol), 4-benzyloxypyridone (80 mg, 0.33 mmol) and Cs₂CO₃ (390 mg, 0.38 mmol) were suspended in DMSO (8.0 mL) and degassed under vacuum for 15 min. The system was then flushed with Ar, and 8-hydroxyquinoline (30 mg, 0.18 mmol) and copper iodide (80 mg, 0.40 mmol) were added. The degassing/Ar flushing process was repeated twice, and the reaction mixture was heated at 133° C. for 18 h under argon. The mixture was cooled, diluted with 15% solution of concentrated ammonium hydroxide in methanol (25 mL) and stirred at ambient temperature for 30 min. The reaction was further diluted with CH₂Cl₂ (75 mL) and filtered through silica gel and concentrated. The concentrate was diluted with CH₂Cl₂ and washed with H₂O (25 mL) and brine (3×50 mL). The combined organics were dried over Na₂SO₄, filtered and concentrated under reduced pressure to dryness. The crude material was purified by flash chromatography (silica gel, (1:1 hexanes/EtOAc)/(10:1:0.1 dichloromethane/methanol/concentrated ammonium hydroxide), 1:0 to 0:1) to afford 75 mg of crude material containing the desired product. The crude mixture was dissolved in a mixture of dichloromethane and methanol (1:1, 5 mL), treated with TFA (2 mL) and stirred at ambient temperature for 30 min. The solvent was removed under reduced pressure, and the residue was neutralized by ion-exchange chromatography (SCX-2 column, 5 g). Purification by preparatory TLC (silica gel, 10:1:0.1 dichloromethane/methanol/concentrated ammonium hydroxide) provided the free base of the title compound (12 mg, 10%) as a white foam: ESI MS m/z 404 [M+H]⁺. The free base was dissolved in methanol (25 mL) and treated with a solution of HCl (1.25M in methanol, 0.1 mL, 0.13 mmol). The reaction mixture was sonicated for 5 min at ambient temperature. The mixture was concentrated, and the resulting residue was lyophilized from water (5 mL) to afford the title compound (14 mg, 8%) as a white powder: ¹H NMR (500 MHz, DMSO-d₆) δ 9.56 (br s, 2H), 7.61 (d, J=6.0 Hz, 1H), 7.54 (d, J=7.5 Hz, 1H), 7.50-7.37 (m, 6H), 6.14-6.12 (m, 1H), 5.99 (s, 1H), 5.16 (s, 2H), 4.46 (br s, 2H), 3.67 (s, 3H), 3.43 (br m, 2H), 2.94 (m, 2H); ESI MS m/z 404 [M+H]⁺; HPLC (Method A) 95.7% (AUC), t_(R)=14.8 min

Example 142 Preparation of 4-(Benzyloxy)-1-(2-ethyl-9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

To a solution of 4-(benzyloxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride (120 mg, 0.28 mmol) in dichloromethane/acetic acid (1% acetic acid, 10 mL) were sequentially added acetaldehyde (0.50 mL, 13 mmol) and NaBH(OAc)₃ (1.0 g, 4.7 mmol). The reaction mixture was stirred at ambient temperature for 1 h. The mixture was concentrated, and the residue was purified by flash chromatography (silica gel silica gel, (1:1 hexanes/EtOAc)/(10:1:0.1 dichloromethane/methanol/concentrated ammonium hydroxide), 1:0 to 0:1) to provide 4-(benzyloxy)-1-(2-ethyl-9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one (120 mg, 72%) as a white solid. The free base was converted to the HCl salt using 1.25M HCl in methanol, providing the title compound (120 mg, 95%) as an off-white solid: ¹H NMR (500 MHz, DMSO-d₆) δ 7.57 (d, J=7.5 Hz, 1H), 7.54-7.34 (m, 7H), 6.97 (d, J=8.0 Hz, 1H), 6.10 (dd, J=7.5, 2.0 Hz, 1H), 5.97 (s, 1H), 5.16 (s, 2H), 3.67 (s, 3H), 3.45-3.18 (4H, overlapping with solvent peak), 3.26 (br m, 2H), 2.96 (m, 2H), 1.33 (br m, 3H); ESI MS m/z 414 [M+H]⁺; HPLC (Method A) 95.7% (AUC), t_(R)=14.6 min.

Example 143 Preparation of 4-(Benzyloxy)-1-(2-isopropyl-9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

2-Bromopropane (1.5 mL, 16 mmol) was added to a mixture of 4-(benzyloxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride (138 mg, 0.327 mmol) and Cs₂CO₃ (1.2 g, 3.7 mmol) in acetonitrile (25 mL). The mixture was stirred at 55° C. for 72 h. The resulting mixture was cooled, and the precipitate was filtered off. The mother liquor was concentrated under vacuum. The residue was purified by preparatory TLC (silica gel, 10:1:0.1 dichloromethane/methanol/concentrated ammonium hydroxide) to afford 4-(benzyloxy)-1-(2-isopropyl-9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one. The free base was converted to the HCl salt using 1.25M HCl in methanol to provide the title compound (26 mg, 19%) as a off white solid: ¹H NMR (500 MHz, DMSO-d₆) δ 10.50 (s, 1H), 7.56 (d, J=4.5 Hz, 2H), 7.52-7.38 (m, 6H), 7.01 (dd, J=4.5, 1.0 Hz, 1H), 6.11 (dd, J=4.5, 1.0 Hz, 1H), 5.97 (s, 1H), 5.16 (s, 2H), 4.60-4.53 (m, 2H), 3.78-3.70 (m, 2H), 3.70 (s, 3H), 3.40-3.28 (m, 1H), 3.18-2.98 (m, 2H), 1.44-1.39 (m, 6H); ESI MS m/z 428 [M+H]⁺; HPLC (Method A) 95.7% (AUC), t_(R)=15.1 min.

Example 144 Preparation of Isopropyl 7-(4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-9-methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)-carboxylate

Following the procedure of Example 143, the title compound (12 mg, 8%) was obtained as a second product as an off-white powder after lyophilization from acetonitrile/water: ¹H NMR (500 MHz, CDCl₃) δ 7.48 (d, J=8.5 Hz, 1H), 7.50-7.32 (m, 7H), 6.99 (d, J=8.5 Hz, 1H), 6.90 (s, 1H), 6.34 (d, J=6.5 Hz, 1H), 5.17 (s, 2H), 5.05-5.00 (m, 1H), 4.72-4.58 (m, 2H), 3.79 (br m, 2H), 3.76 (s, 3H), 2.82 (m, 2H), 1.42-1.32 (m, 6H); ESI MS m/z 472 [M+H]⁺; HPLC (Method A) 95.7% (AUC), t_(R)=19.9 min.

Example 145 Preparation of 4-(Benzyloxy)-3-bromo-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridine-2(1H)-one hydrochloride

2-Bromopropane (0.25 mL, 2.7 mmol) was added to a solution of 4-(benzyloxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one in DMSO (5 mL). The reaction mixture was stirred at 55° C. for 3 d. The mixture was diluted with a saturated solution of sodium bicarbonate and extracted with dichloromethane (3×50 mL). The combined organics were washed with water and brine, dried over sodium sulfate and concentrated under reduced pressure. Purification by preparatory TLC (silica gel, 10:1:0.1 dichloromethane/methanol/concentrated ammonium hydroxide) provided the free base of the title compound. The free base was converted to the HCl salt using 2.5M HCl in methanol to afford, after lyophilization from acetonitrile/water, the title compound (15 mg, 14%) as a yellow solid: ¹H NMR (300 MHz, CD₃OD) δ 7.71 (d, J=7.8 Hz, 1H), 7.63 (d, J=8.4, Hz, 1H), 7.53-7.30 (m, 6H), 7.05 (dd, J=7.8, 1.2 Hz, 1H), 6.60 (d, J=7.6 Hz, 1H), 5.40 (s, 2H), 4.54 (s, 2H), 3.71 (s, 3H), 3.62-3.55 (m, 2H), 3.22-3.02 (m, 2H); ESI MS m/z 465 [M+H]⁺; HPLC (Method A) 95.7% (AUC), t_(R)=15.3 min.

Example 146 Preparation of 4-(Benzyloxy)-1-(2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride a) Di-tert-butyl 7-bromo-3,4-dihydro-1H-pyrido[4,3-b]indole-2,5-dicarboxylate

To a solution of tert-butyl 7-bromo-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (1.00 g, 2.85 mmol), Boc₂O (683 mg, 3.13 mol) and triethylamine (0.73 mL, 5.7 mmol) in methylene chloride (30 mL) at room temperature was added DMAP (50 mg, 0.41 mmol), and the reaction progressed for 18 h. The mixture was washed with 0.5N HCl, and the organic phase was removed, dried over Na₂SO₄, filtered and concentrated to dryness. The crude title product (1.25 g, 98%) was recovered as an orange solid: ¹H NMR (500 MHz, CDCl₃) δ 8.37 (br s, 1H), 7.34 (dd, J=8.2, 1.6 Hz, 1H), 7.24 (d, J=8.25 Hz, 1H), 4.54 (br s, 2H), 3.73 (m, 2H), 3.07 (t, J=5.6 Hz, 2H), 1.66 (s, 9H), 1.50 (s, 9H).

b) tert-Butyl 7-(4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

Prepared from di-tert-butyl 7-bromo-3,4-dihydro-1H-pyrido[4,3-b]indole-2,5-dicarboxylate (1.24 g, 2.72 mmol) and 4-benzyloxypyridone (547 mg, 2.72 mmol) according to the procedure of Example 1 (step c). Purification by flash column chromatography (silica gel, hexanes/ethyl acetate, 100:0 to 80:20 to 50:50 to 25:75 then 0:100) gave the title compound (155 mg, 10%) as a yellow solid: ¹H NMR (500 MHz, CDCl₃) δ 9.40 (br s, 1H), 7.44-7.38 (m, 5H), 7.30 (d, J=7.5 Hz, 1H), 7.22 (d, J=8.2 Hz, 1H), 7.16 (s, 1H), 6.82 (dd, J=8.2, 1.4 Hz, 1H), 6.12-6.09 (m, 2H), 5.09 (s, 2H), 4.46 (br s, 2H), 3.70 (br m, 2H), 2.54 (br m, 2H), 1.50 (s, 9H).

c) 4-(Benzyloxy)-1-(2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride

Prepared from tert-butyl 7-(4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (150 mg, 0.32 mmol) according to the procedure of Example 1 (step d). Purification by flash column chromatography (4 g ISCO column eluting with methylene chloride and a methanol/ammonia mixture (10:1); gradient 100% methylene chloride to 85% methylene chloride over 30 min) provided the free-base as a yellow solid. This was converted to the bis-HCl salt (2N HCl/Et₂O in CH₂Cl₂) providing the title compound (36 mg, 26%) as a yellow solid: mp 240° C. dec.; ¹H NMR (500 MHz, CD₃OD) δ 7.65 (d, J=7.5 Hz, 1H), 7.57 (d, J=8.2 Hz, 1H), 7.47 (d, J=7.2 Hz, 2H), 7.42-7.36 (m, 4H), 7.03 (d, J=8.5 Hz, 1H), 6.39 (dd, J=7.6, 2.5 Hz, 1H), 6.21 (d, J=2.5 Hz, 1H), 5.21 (s, 2H), 4.47 (s, 2H), 3.64 (t, J=6.0 Hz, 2H), 3.20 (t, J=6.1 Hz, 2H); ESI MS m/z 372 [M+H]⁺; HPLC (Method A) 95.0% (AUC), t_(R)=12.2 min.

Example 147 Preparation of 4-(Benzyloxy)-1-(5-ethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride a) tert-Butyl 7-bromo-5-ethyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

Prepared from tert-butyl 7-bromo-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (500 mg, 1.43 mmol) according to the procedure of Example 1 (step b). This provided the title compound (520 mg, 96%) as a yellow/orange solid: ¹H NMR (500 MHz, CDCl₃) δ 7.36 (s, 1H), 7.23 (d, J=8.3 Hz, 1H), 7.10 (d, J=8.2 Hz, 1H), 4.54 (s, 2H), 3.96 (q, J=7.2 Hz, 2H), 3.76 (br m, 2H), 2.71 (br m, 2H), 1.43 (s, 9H), 1.25 (t, J=7.2 Hz, 3H).

b) tert-Butyl 7-(4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-5-ethyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate

Prepared from tert-butyl 7-bromo-5-ethyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (500 mg, 1.32 mmol) and 4-benzyloxypyridone (265 mg, 1.32 mmol), according to the procedure of Example 1 (step c). Purification by flash column chromatography (silica gel, hexanes/EtOAc, 100:0 to 80:20 to 50:50 to 25:75 then 0:100) gave the title compound (317 mg, 48%) as a yellow solid: ¹H NMR (300 MHz, CDCl₃) δ 7.53 (d, J=8.2 Hz, 1H), 7.44-7.37 (m, 5H), 7.32-7.29 (m, 2H), 7.04 (d, J=8.0 Hz, 1H), 6.10-6.03 (m, 2H), 5.08 (s, 2H), 4.66 (br s, 2H), 4.10 (q, J=7.1 Hz, 2H), 3.86 (br m, 2H), 2.84 (br m, 2H), 1.53 (s, 9H), 1.25 (t, J=7.1 Hz, 3H).

c) 4-(Benzyloxy)-1-(5-ethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one dihydrochloride

Prepared from tert-butyl 7-(4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-5-ethyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (315 mg, 0.631 mmol) according to the procedure of Example 1 (step d) providing the title compound (207 mg, 74%) as a yellow solid: mp 176-181° C.; ¹H NMR (300 MHz, CD₃OD) δ 7.83 (d, J=7.5 Hz, 1H), 7.62-7.57 (m, 2H), 7.45-7.40 (m, 5H), 7.09 (dd, J=8.4, 1.6 Hz, 1H), 6.59 (dd, J=7.5, 2.3 Hz, 1H), 6.36 (d, J=2.3 Hz, 1H), 5.28 (s, 2H), 4.49 (s, 2H), 4.23 (q, J=7.2 Hz, 2H), 3.68 (t, J=6.1 Hz, 2H), 3.22 (t, J=5.9 Hz, 2H), 1.35 (t, J=7.1 Hz, 3H); ESI MS m/z 400 [M+H]⁺; HPLC (Method A) >99% (AUC), t_(R)=13.2 min.

In accordance with further embodiments of the invention, there are provided the following compounds, which may be synthesized by analogy by the methods shown and described above:

Name Structure 1-(2-Isobutyryl-5-methyl-2,3,4,5-tetrahydro-1H- pyrido[4,3-b]indol-7-yl)-4-(5-(trifluoromethyl)pyridin- 2-yl)pyridin-2(1H)-one

1-(5-Methyl-2-propionyl-2,3,4,5-tetrahydro-1H- pyrido[4,3-b]indol-7-yl)-4-(5-(trifluoromethyl)pyridin- 2-yl)pyridin-2(1H)-one

4-(Benzyloxy)-1-(4,4,5-trimethyl-2,3,4,5-tetrahydro- 1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one

N,N,5-Trimethyl-7-(2-oxo-4-(5- (trifluoromethyl)pyridin-2-yl)pyridin-1(2H)-yl)-3,4- dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxamide

4-((5-Fluoropyridin-2-yl)methoxy)-1-(2-isobutyryl-5- methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7- yl)pyridin-2(1H)-one

1-(2-Ethyl-5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3- b]indol-7-yl)-4-((5-fluoropyridin-2- yl)methoxy)pyridin-2(1H)-one

1-(2-(3-Hydroxy-2,2-dimethylpropanoyl)-5-methyl- 2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(5- (trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one

1-(2-(3-Hydroxy-3-methylbutanoyl)-5-methyl-2,3,4,5- tetrahydro-1H-pyrido[4,3-b]indol-7-yl)-4-(5- (trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one

1-(2-(2-Hydroxyacetyl)-5-methyl-2,3,4,5-tetrahydro- 1H-pyrido[4,3-b]indol-7-yl)-4-(5- (trifluoromethyl)pyridin-2-yl)pyridin-2(1H)-one

4-(Benzyloxy)-1-(2-isopropyl-9-methyl-2,3,4,9- tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)- one

Isopropyl 7-(4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-9- methyl-3,4-dihydro-1H-pyrido[3,4-b]indole-2(9H)- carboxylate

1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol- 7-yl)-4-(5-(trifluoromethyl)pyrazin-2-yl)pyridin- 2(1H)-one

1-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol- 7-yl)-4-(5-(trifluoromethyl)pyrazin-2-yl)pyridin- 2(1H)-one

2-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol- 7-yl)-5-(5-(trifluoromethyl)pyridin-2-yl)pyridazin- 3(2H)-one

2-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol- 7-yl)-5-(5-(trifluoromethyl)pyridin-2-yl)pyridazin- 3(2H)-one

2-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol- 7-yl)-5-(6-(trifluoromethyl)pyridazin-3-yl)pyridazin- 3(2H)-one

2-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol- 7-yl)-5-(6-(trifluoromethyl)pyridazin-3-yl)pyridazin- 3(2H)-one

2-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol- 7-yl)-5-(4-(trifluoromethyl)phenyl)pyridazin-3(2H)- one

2-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol- 7-yl)-5-(4-(trifluoromethyl)phenyl)pyridazin-3(2H)- one

4-(Benzyloxy)-1-(2-isobutyl-5-methyl-2,3,4,5- tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)- one

4-(Benzyloxy)-1-(2-isobutyl-9-methyl-2,3,4,9- tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)- one

4-(Benzyloxy)-1-(2-(cyclopropylmethyl)-5-methyl- 2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin- 2(1H)-one

4-(Benzyloxy)-1-(2-(cyclopropylmethyl)-9-methyl- 2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin- 2(1H)-one

4-(5-Methoxypyridin-2-yl)-1-(5-methyl-2,3,4,5- tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)- one

4-(5-Methoxypyridin-2-yl)-1-(9-methyl-2,3,4,9- tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)- one

4-(Benzyloxy)-1-(4,4,9-trimethyl-2,3,4,9-tetrahydro- 1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one

4-(Benzyloxy)-1-(1,1,5-trimethyl-2,3,4,5-tetrahydro- 1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one

4-(Benzyloxy)-1-(1,1,3,3,5-pentamethyl-2,3,4,5- tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)- one

4-(Benzyloxy)-1-(3,3,5-trimethyl-2,3,4,5-tetrahydro- 1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one

1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol- 7-yl)-4-(4-(methylsulfonyl)phenyl)pyridin-2(1H)-one

1-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol- 7-yl)-4-(4-(methylsulfonyl)phenyl)pyridin-2(1H)-one

1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol- 7-yl)-4-(4-(methylsulfinyl)phenyl)pyridin-2(1H)-one

1-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol- 7-yl)-4-(4-(methylsulfinyl)phenyl)pyridin-2(1H)-one

1-(5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol- 7-yl)-4-(5-(methylthio)pyridin-2-yl)pyridin-2(1H)-one

1-(9-Methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol- 7-yl)-4-(5-(methylthio)pyridin-2-yl)pyridin-2(1H)-one

Binding Assay I for Human Melanin-Concentrating Hormone (MCH₁) Receptor

Evaluation of the affinity of compounds for the human MCH₁ receptor was accomplished in transfected Chinese Hamster Ovary (CHO) cells determined in a radioligand binding assay, as described in MacDonald et al., “Molecular characterization of the melanin-concentrating hormone/receptor complex: identification of critical residues involved in binding and activation”, Mol Pharmacol., 58:217 (2000). Cell membrane homogenates (5 g protein) were incubated for 60 min at 22° C. with 0.1 nM [¹²⁵I][Phe¹³,Tyr¹⁹]-MCH in the absence or presence of the test compound in a buffer containing 25 mM Hepes/Tris (pH 7.4), 5 mM MgCl₂, 1 mM CaCl₂ and 0.5% bovine serum albumin (BSA). Nonspecific binding was determined in the presence of 0.1M MCH. Following incubation, the samples were filtered rapidly under vacuum through glass fiber filters (GF/B, Packard) and rinsed several times with an ice-cold buffer containing 25 mM Hepes/Tris (pH 7.4), 500 mM NaCl, 5 mM MgCl₂, 1 mM CaCl₂ and 0.1% BSA using a 96-sample cell harvester (Unifilter, Packard). The filters were dried, then counted for radioactivity in a scintillation counter (Topcount, Packard) using a scintillation cocktail (Microscint 0, Packard).

The results are expressed as a percent inhibition of the control radioligand specific binding. The IC₅₀ value (concentration causing a half-maximal inhibition of control specific binding) and Hill coefficient (n_(H)) were determined by non-linear regression analysis of the competition curve using Hill equation curve fitting. The inhibition constant (K_(i)) was calculated from the Cheng Prusoff equation: (K_(i)=IC₅₀/(1+(L/K_(D))), where L=concentration of radioligand in the assay, and K_(D)=affinity of the radioligand for the receptor).

Binding Assay II for Human Melanin-Concentrating Hormone (MCH1) Receptor

Evaluation of the affinity of compounds for the human MCH₁ receptor was accomplished using 4-(3,4,5-tritritiumbenzyloxy)-1-(1-(2-(pyrrolidin-1-yl)ethyl)-1H-indazol-5-yl)pyridin-2(1H)-one and membranes prepared from stable CHO-K1 cells expressing the human MCH₁ receptor obtained from Euroscreen (Batch 1138). Cell membrane homogenates (8.92 g protein) were incubated for 60 min at 25° C. with 1.4 nM of the [³H]-labeled compound in the absence or presence of the test compound in 50 mM Tris-HCl buffer, pH 7.4. Nonspecific binding was determined in the presence of 50 μM 1-(5-(4-cyanophenyl)bicyclo[3.1.0]hexan-2-yl)-3-(4-fluoro-3-(trifluoromethyl)phenyl)-1-(3-(4-methylpiperazin-1-yl)propyl)urea. Following incubation, the samples were filtered rapidly under vacuum through Skatron 11731 filters, pre-soaked in 0.5% polyethylenimine, and washed with ice-cold 50 mM Tris-HCl buffer, pH 7.4, (wash setting 9,9,0) using a Skatron cell harvester. The filters were counted for radioactivity in a liquid scintillation counter (Tri-Carb 2100TR, Packard) using a scintillation cocktail (Ultima Gold MV, Perkin Elmer).

The results are expressed as a percent inhibition of the control radioligand specific binding. The IC₅₀ value (concentration causing a half-maximal inhibition of control specific binding) and Hill coefficient (n_(H)) were determined by non-linear regression analysis of the competition curve using Hill equation curve fitting. The inhibition constant (K_(i)) was calculated from the Cheng Prusoff equation: (K_(i)=IC₅₀/(1+(L/K_(D))), where L=concentration of radioligand in the assay, and K_(D)=affinity of the radioligand for the receptor.

By methods as described above, the compounds listed in TABLE 1 were synthesized and tested for biological activity. All of the compounds in TABLE 1 exhibited K_(i) of less than or equal to 3.5 μM in MCH₁ binding assays I or II.

TABLE 1 Ex. Mass No. Structure Spec ¹H NMR Data 1

386 ¹H NMR (500 MHz, CD₃OD) δ 7.61-7.57 (2 × d, 2H), 7.47-7.46 (m, 3H), 7.43-7.40 (m, 2H), 7.37- 7.34 (m, 1H), 7.05 (dd, J = 8.3, 1.7 Hz, 1H), 6.33 (dd, J = 7.5, 2.7 Hz, 1H), 6.16 (d, J = 2.6 Hz, 1H), 5.19 (s, 2H), 4.57 (s, 2H), 3.73 (s, 3H), 3.67 (t, J = 6.2 Hz, 2H), 3.20 (t, J = 6.1 Hz, 2H) 2

400 ¹H NMR (500 MHz, CD₃OD) δ 7.57 (dd, J = 7.6, 1.7 Hz, 2H), 7.47-7.46 (m, 3H) 7.43-7.34 (m, 3H), 7.06 (dd, J = 8.4, 1.9 Hz, 1H), 6.29 (dd, J = 7.6, 2.7 Hz, 1H), 6.13 (d, J = 2.6 Hz, 1H), 5.18 (s, 2H), 4.75 (d, J = 14.3 Hz, 1H), 4.38 (d, J = 14.2 Hz, 1H), 3.90 (m, 1H), 3.73 (s, 3H), 3.64-3.58 (m, 1H), 3.29-3.26 (m, 2H, partially masked by solvent), 3.13 (s, 3H) 3

430 ¹H NMR (500 MHz, CD₃OD) δ 7.63 (dd, J = 7.6, 2.0 Hz, 2H), 7.51-7.50 (m, 3H) 7.46-7.43 (m, 2H), 7.41-7.38 (m, 1H), 7.09 (dd, J = 8.3, 1.7 Hz, 1H), 6.36 (dd, J = 7.6, 2.7 Hz, 1H), 6.18 (d, J = 2.7 Hz, 1H), 5.23 (s, 2H), 4.82 (d, 1H, partially masked by solvent), 4.520 (d, J = 14.3 Hz, 1H), 4.06-4.02 (m, 3H), 3.77 (s, 3H), 3.70-3.68 (m, 1H), 3.55-3.51 (m, 2H), 3.33-3.31 (m, 2H, partially masked by solvent) 4

497 ¹H NMR (500 MHz, CD₃OD) δ 7.62 (dd, J = 7.7, 1.9 Hz, 1H), 7.53 (d, J = 8.0 Hz, 1H) 7.46-7.44 (m, 2H), 7.41-7.35 (m, 4H), 7.06 (dd, J = 8.0, 1.7 Hz, 1H), 6.36 (d, J = 7.6 Hz, 1H), 6.18 (s, 1H), 5.25 (s, 2H), 4.90 (m, 1H, masked by solvent), 4.82 (s, 1H), 4.53 (d, J = 14.2 Hz, 2H), 4.09 (t, J = 6.5 Hz, 1H), 3.91 (t, J = 6.4 Hz, 1H), 3.89-3.86 (m, 2H), 3.77 (s, 3H), 3.20-3.18 (m, 2H), 3.05- 3.03 (m, 1H), 2.99-2.97 (m, 1H), 2.12-2.10 (m, 2H), 2.08-2.05 (m, 2H) 5

468 ¹H NMR (300 MHz, CD₃OD) δ 7.48 (d, J = 7.5 Hz, 1H), 7.40-7.24 (m, 7H), 6.87 (dd, J = 8.3, 1.9 Hz, 1H), 6.19 (dd, J = 7.6, 2.7 Hz, 1H), 6.03 (d, J = 2.7 Hz, 1H), 5.08 (s, 2H), 3.96 (s, 2H), 3.58 (s, 3H), 3.37 (q, J = 9.7 Hz, 2H), 3.15-3.14 (m, 2H, partially masked by solvent), 2.87 (t, J = 5.5 Hz, 2H) 6

482 ¹H NMR (500 MHz, CD₃OD) δ 7.66 (d, J = 8.3 Hz, 1H), 7.63 (d, J = 7.6 Hz, 1H), 7.52-7.51 (m, 3H), 7.48-7.45 (m, 2H), 7.43 (d, J = 7.2 Hz, 1H), 7.11 (dd, J = 8.3, 1.7 Hz, 1H), 6.36 (dd, J = 7.6, 2.7 Hz, 1H), 6.19 (d, J = 2.7 Hz, 1H), 5.24 (s, 2H), 4.96 (m, 6H, masked by solvent), 3.79-3.74 (m, 5H), 3.03-3.02 (m, 2H) 7

454 ¹H NMR (500 MHz, CD₃OD) δ 7.77 (d, J = 8.3 Hz, 2H), 7.71 (d, J = 8.2 Hz, 2H), 7.65 (d, J = 7.6 Hz, 1H), 7.62 (d, J = 8.3 Hz, 1H), 7.50 (s, 1H), 7.09 (dd, J = 8.3, 1.8 Hz, 1H), 6.38 (dd, J = 7.6, 2.7 Hz, 1H), 6.17 (d, J = 2.7 Hz, 1H), 5.33 (s, 2H), 4.51 (s, 2H), 3.77 (s, 3H), 3.71 (t, J = 6.2 Hz, 2H), 3.24 (t, J = 6.1 Hz, 2H) 8

420 ¹H NMR (500 MHz, DMSO-d₆) δ 9.54 (br s, 2H), 7.57 (m, 2H), 7.51 (s, 5H), 6.99 (d, J = 7.8 Hz, 1H), 6.12 (dd, J = 7.8, 2.7 Hz, 1H), 5.99 (d, J = 2.7 Hz, 1H), 5.16 (s, 2H), 4.33 (br s, 2H), 3.68 (s, 3H), 3.52-3.48 (m, 2H), 3.12-3.08 (m, 2H) 9

384 ¹H NMR (500 MHz, CD₃OD) δ 7.70 (d, J = 6.9 Hz, 1H), 7.62 (d, J = 8.3 Hz, 1H), 7.52 (s, 1H), 7.33-7.26 (m, 4H), 7.22 (t, J = 7.2 Hz, 1H), 7.09 (dd, J = 8.3, 1.6 Hz, 1H), 6.59-6.56 (m, 2H), 4.50 (s, 2H), 3.76 (s, 3H), 3.70 (t, J = 6.2 Hz, 2H), 3.24 (t, J = 6.0 Hz, 2H), 3.04-3.01 (m, 2H), 2.98-2.95 (m, 2H) 10

424 ¹H NMR (500 MHz, CD₃OD) δ 7.95 (d, J = 8.2 Hz, 2H), 7.84 (d, J = 8.2 Hz, 2H), 7.81 (d, J = 7.1 Hz, 1H), 7.63 (d, J = 8.3 Hz, 1H), 7.57 (s, 1H), 7.14 (dd, J = 8.3, 1.3 Hz, 1H), 6.96 (d, J = 1.6 Hz, 1H), 6.87 (dd, J = 7.1, 1.7 Hz, 1H), 4.50 (s, 2H), 3.76 (s, 3H), 3.68 (t, J = 6.1 Hz, 2H), 3.22 (t, J = 6.1 Hz, 2H) 11

390 ¹H NMR (500 MHz, CD₃OD) δ 7.80-7.78 (m, 3H), 7.66 (d, J = 8.5 Hz, 1H), 7.58-7.57 (m, 3H), 7.16 (dd, J = 8.3, 1.7 Hz, 1H), 6.94 (d, J = 1.8 Hz, 1H), 6.87 (dd, J = 7.1, 1.9 Hz, 1H), 6.17 (d, J = 2.7 Hz, 1H), 4.53 (s, 2H), 3.79 (s, 3H), 3.72 (t, J = 5.9 Hz, 2H), 3.25 (t, J = 5.9 Hz, 2H) 12

424 ¹H NMR (500 MHz, CD₃OD) δ 7.80 (d, J = 7.0 Hz, 1H), 7.70 (s, 1H), 7.68 (d, J = 7.9 Hz, 1H), 7.62 (s, 1H), 7.54 (s, 2H), 7.13 (d, J = 7.0 Hz, 1H), 6.73 (s, 1H), 6.61 (d, J = 7.2 Hz, 1H), 4.54 (s, 2H), 3.80 (s, 3H), 3.72 (t, J = 6.0 Hz, 2H), 3.26 (t, J = 5.9 Hz, 2H) 13

386 ¹H NMR (500 MHz, CD₃OD) δ 7.59 (d, J = 7.5 Hz, 1H), 7.54 (d, J = 9.0 Hz, 1H), 7.48-7.40 (m, 5H), 7.38-7.36 (m, 1H), 7.17 (dd, J = 8.5, 1.5 Hz, 1H), 6.33 (dd, J = 7.5, 2.5 Hz, 1H), 6.16 )d, J = 2.5 Hz, 1H), 5.20 (s, 2H), 4.45 (s, 2H), 3.77 (s, 3H), 3.67 (t, J = 6.0 Hz, 2H), 3.21 (t, J = 6.0 Hz, 2H) 14

400 ¹H NMR (500 MHz, DMSO-d₆) δ 10.26 (s, 1H), 7.56-7.36 (m, 8H), 7.10 (dd, J = 8.5, 1.5 Hz, 1H), 6.10 (dd, J = 7.5, 3.0 Hz, 1H), 5.97 (d, J = 3.0 Hz, 1H), 5.15 (s, 2H), 4.58 (m, 1H), 4.27 (m, 1H), 3.78 (m, 1H), 3.72 (s, 3H), 3.50 (m, 1H), 3.18 (m, 2H), 2.97 (s, 3H) 15

527 ¹H NMR (500 MHz, CD₃OD) δ 7.78-7.75 (m, 1H), 7.57-7.54 (m, 1H), 7.49-7.37 (m, 6H), 7.04- 7.01 (m, 1H), 6.55-6.52 (m, 1H), 6.33-6.31 (m, 1H), 5.26 (s, 2H), 4.80-4.73 (m, 2H), 4.49-4.48 (m, 2H), 3.94-3.93 (m, 2H), 3.82-3.72 (m, 2H), 3.69 (s, 3H), 3.58-3.57 (m, 2H), 3.20-3.14 (m, 2H), 2.98-2.94 (m, 2H), 2.15-1.99 (m, 4H) 16

471 ¹H NMR (500 MHz, CD₃OD) δ 7.75-7.71 (m, 1H), 7.59-7.55 (m, 1H), 7.49-7.37 (m, 6H), 7.05- 7.01 (m, 1H), 6.49-6.45 (m, 1H), 6.28-6.26 (m, 1H), 5.24 (s, 2H), 4.87 (br s, 1H), 4.69 (br s, 1H), 4.44-4.41 (m, 2H), 4.11-4.07 (m, 1H), 3.85-3.82 (m, 1H), 3.70 (2 × s, 3H), 3.06-2.92 (m, 2H), 2.97-2.94 (2 × s, 6H) 17

497 ¹H NMR (500 MHz, CD₃OD) δ 7.60 (d, J = 7.5 Hz, 1H), 7.56 (d, J = 8.0 Hz, 1H), 7.49-7.35 (m, 6H), 7.06 (dd, J = 8.5, 1.5 Hz, 1H), 6.33 (dd, J = 7.5, 3.0 Hz, 1H), 6.16 (d, J = 3.0 Hz, 1H), 5.20 (s, 2H), 4.80 (d, J = 14.5 Hz, 1H), 4.54 (d, J = 14.5 Hz, 1H), 4.36 (s, 2H), 4.00-3.98 (m, 1H), 3.75 (s, 3H), 3.68-3.65 (m, 1H), 3.54 (t, J = 7.0 Hz, 2H), 3.49-3.45 (m, 2H), 3.35-3.33 (m, 2H), 2.05-1.92 (m, 4H) 18

511 ¹H NMR (500 MHz, CD₃OD) δ 7.79-7.76 (m, 1H), 7.61-7.55 (m, 1H), 7.49-7.36 (m, 6H), 7.05- 7.02 (m, 1H), 6.55-6.52 (m, 1H), 6.33-6.32 (m, 1H), 5.26 (s, 2H), 4.06 (t, J = 5.5 Hz, 1H), 3.94 (t, J = 5.5 Hz, 1H), 3.70-3.69 (m, 5H), 3.54-3.50 (m, 2H), 3.18-2.89 (m, 8H), 2.18-2.04 (m, 4H) 19

483 ¹H NMR (500 MHz, CD₃OD) δ 7.75-7.72 (m, 1H), 7.63-7.55 (m, 1H), 7.49-7.36 (m, 6H), 7.05- 7.02 (m, 1H), 6.51-6.46 (m, 1H), 6.29-6.27 (m, 1H), 5.25 (s, 2H), 4.79-4.76 (m, 2H), 4.14-3.97 (m, 2H), 3.87-3.82 (m, 1H), 3.71-3.69 (m, 4H), 3.60-3.50 (m, 1H), 3.45-3.36 (m, 3H), 3.04-3.03 (m, 1H), 2.94-2.92 (m, 1H), 2.52-2.36 (m, 1H), 2.18-2.00 (m, 1H) 20

483 ¹H NMR (500 MHz, CD₃OD) δ 7.82-7.79 (m, 1H), 7.66-7.56 (m, 1H), 7.49-7.36 (m, 6H), 7.07- 7.03 (m, 1H), 6.59-6.56 (m, 1H), 6.36 (dd, J = 5.0, 2.5 Hz, 1H), 5.28 (s, 2H), 4.82-4.81 (m, 2H), 4.14-4.05 (m, 1H), 3.97-3.95 (m, 1H), 3.71-3.69 (2 × s, 3H), 3.58-3.34 (m, 3H), 3.07-2.94 (m, 2H), 2.70-2.57 (m, 1H), 2.17-1.85 (m, 3H) 21

483 ¹H NMR (500 MHz, CD₃OD) δ 7.82-7.79 (m, 1H), 7.66-7.56 (m, 1H), 7.49-7.36 (m, 6H), 7.07- 7.03 (m, 1H), 6.59-6.56 (m, 1H), 6.36 (dd, J = 5.0, 2.5 Hz, 1H), 5.28 (s, 2H), 4.82-4.81 (m, 2H), 4.14-4.05 (m, 1H), 3.97-3.95 (m, 1H), 3.71-3.69 (2 × s, 3H), 3.58-3.34 (m, 3H), 3.07-2.94 (m, 2H), 2.70-2.57 (m, 1H), 2.17-1.85 (m, 3H) 22

497 ¹H NMR (500 MHz, CD₃OD) δ 7.61-7.33 (m, 8H), 7.02-6.98 (m, 1H), 6.29-6.27 (m, 1H), 6.12- 6.11 (m, 1H), 5.17 (s, 2H), 4.79-4.76 (m, 2H), 4.09-3.97 (m, 2H), 3.81-3.79 (m, 1H), 3.69-3.67 (m, 4H), 3.49-3.42 (m, 1H), 3.22-3.16 (m, 2H), 3.00 (m, 1H), 2.92-2.91 (m, 1H), 2.81-2.78 (2 × s, 3H), 2.52-2.36 (m, 1H), 2.18-2.00 (m, 1H) 23

497 ¹H NMR (500 MHz, CD₃OD) δ 7.61-7.33 (m, 8H), 7.03-6.99 (m, 1H), 6.30 (dd, J = 7.5, 2.5 Hz, 1H), 6.13 (d, J = 2.5 Hz, 1H), 5.18 (s, 2H), 4.80- 4.70 (m, 2H), 4.12-4.09 (m, 1H), 3.92-3.90 (m, 1H), 3.78-3.72 (m, 1H), 3.69-3.68 (2 s, 3H), 3.49-3.42 (m, 1H), 3.28-3.20 (m, 1H), 3.07-3.00 (m, 2H), 2.96-2.94 (2 s, 3H), 2.79-2.65 (m, 1H), 2.21-2.09 (m, 1H), 2.09-1.86 (m, 2H) 24

497 ¹H NMR (500 MHz, CD₃OD) δ 7.61-7.33 (m, 8H), 7.03-6.99 (m, 1H), 6.30 (dd, J = 7.5, 2.5 Hz, 1H), 6.13 (d, J = 2.5 Hz, 1H), 5.18 (s, 2H), 4.80- 4.70 (m, 2H), 4.12-4.09 (m, 1H), 3.92-3.90 (m, 1H), 3.78-3.72 (m, 1H), 3.69-3.68 (2 s, 3H), 3.49-3.42 (m, 1H), 3.28-3.20 (m, 1H), 3.07-3.00 (m, 2H), 2.96-2.94 (2 × s, 3H), 2.79-2.65 (m, 1H), 2.21-2.09 (m, 1H), 2.09-1.86 (m, 2H) 25

388 ¹H NMR (500 MHz, CD₃OD) δ 7.82-7.79 (m, 2H), 7.75 (d, J = 7.0 Hz, 1H), 7.61 (d, J = 8.5 Hz, 1H), 7.56 (d, J = 1.5 Hz, 1H), 7.29-7.25 (m, 2H), 7.14 (dd, J = 8.5, 1.5 Hz, 1H), 6.88 (d, J = 2.0 Hz, 1H), 6.82 (dd, J = 7.0, 2.0 Hz, 1H), 4.77 (d, J = 14.0 Hz, 1H), 4.41 (d, J = 14.0 Hz, 1H), 3.93- 3.90 (m, 1H), 3.76 (s, 3H), 3.66-3.60 (m, 1H), 3.27 (m, 2H), 3.15 (s, 3H) 26

438 ¹H NMR (500 MHz, CD₃OD) δ 7.95 (d, J = 8.5 Hz, 2H), 7.84 (d, J = 8.5 Hz, 2H), 7.80 (d, J = 7.5 Hz, 1H), 7.62 (d, J = 8.0 Hz, 1H), 7.57 (d, J = 1.5 Hz, 1H), 7.15 (dd, J = 8.5, 2.0 Hz, 1H), 6.96 (d, J = 1.5 Hz, 1H), 6.87 (dd, = 7.5, 2.0 Hz, 1H), 4.78 (d, J = 14.0 Hz, 1H), 4.41 (d, J = 14.0 Hz, 1H), 3.93-3.90 (m, 1H), 3.77 (s, 3H), 3.66-3.60 (m, 1H), 3.27 (m, 2H), 3.15 (s, 3H) 27

404 ¹H NMR (500 MHz, CD₃OD) δ 7.77-7.75 (m, 3H), 7.62 (d, J = 8.5 Hz, 1H), 7.57 (d, J = 2.0 Hz, 1H), 7.56-7.54 (m, 2H), 7.15 (dd, J = 8.5, 2.0 Hz, 1H), 6.91 (d, J = 2.0 Hz, 1H), 6.84 (dd, J = 7.0, 2.0 Hz, 1H), 4.78 (d, J = 14.0 Hz, 1H), 4.41 (d, J = 14.0 Hz, 1H), 3.93-3.90 (m, 1H), 3.77 (s, 3H), 3.66-3.60 (m, 1H), 3.27 (m, 2H), 3.15 (s, 3H) 28

422 ¹H NMR (500 MHz, CD₃OD) δ 7.76 (d, J = 7.0 Hz, 1H), 7.66-7.57 (m, 2H), 7.57 (d, J = 2.0 Hz, 1H), 7.42-7.39 (m, 2H), 7.15 (dd, J = 8.5, 2.0 Hz, 1H), 6.84 (s, 1H), 6.73-6.71 (m, 1H), 4.77 (d, J = 14.0 Hz, 1H), 4.41 (d, J = 14.0 Hz, 1H), 3.93- 3.90 (m, 1H), 3.76(s, 3H), 3.64-3.61 (m, 1H), 3.27 (m, 2H), 3.15 (s, 3H) 29

418 ¹H NMR (500 MHz, CD₃OD) δ 7.72 (d, J = 7.0 Hz, 1H), 7.63-7.56 (m, 3H), 7.15 (dd, J = 8.5, 1.5 Hz, 1H), 6.92 (dd, J = 8.5, 2.5 Hz, 1H), 6.87 (dd, J = 13.0, 2.0 Hz, 1H), 6.83 (s, 1H), 6.76 (d, J = 7.0 Hz, 1H), 4.77 (d, J = 14.0 Hz, 1H), 4.41 (d, J = 14.0 Hz, 1H), 3.94-3.90 (m, 1H), 3.88 (s, 3H), 3.76 (s, 3H), 3.66-3.60 (m, 1H), 3.27 (m, 2H), 3.15 (s, 3H) 30

400 ¹H NMR (500 MHz, CD₃OD) δ 7.67-7.63 (m, 2H), 7.50-7.40 (m, 3H), 7.43-7.35 (m, 3H), 7.08 (dd, J = 8.3, 1.6 Hz, 1H), 6.40 (dd, J = 7.5, 2.6 Hz, 1H), 6.21 (d, J = 2.6 Hz, 1H), 5.22 (s, 2H), 4.81-4.80 (m, 1H), 4.58 (d, J = 15.3 Hz, 1H), 3.88-3.84 (m, 1H), 3.72 (s, 3H), 3.55-3.49 (m, 1H), 3.21-3.16 (m, 5H) 31

398 ¹H NMR (500 MHz, CD₃OD) δ 7.67-7.64 (m, 2H), 7.51 (d, J = 1.8 Hz, 1H), 7.30-7.24 (m, 4H), 7.20-7.17(m, 1H), 7.08 (dd, J = 8.4, 1.9 Hz, 1H), 6.56 (dd, J = 6.9, 1.9 Hz, 1H), 6.53 (s, 1H), 4.85 (m, 1H), 4.49 (d, J = 15.3 Hz, 1H), 3.89-3.84 (m, 1H), 3.72 (s, 3H), 3.55-3.50 (m, 1H), 3.21-3.19 (m, 2H), 3.16 (s, 3H), 3.02-2.99 (m, 2H), 2.96- 2.93 (m, 2H) 32

468 ¹H NMR (500 MHz, CD₃OD) δ 7.78-7.73 (m, 3H), 7.69-7.64 (m, 3H), 7.52 (d, J = 1.8 Hz, 1H), 7.18-7.08 (m, 1H), 6.55-6.52 (m, 1H), 6.28 (d, J = 2.6 Hz, 1H), 5.35 (s, 2H), 4.82-4.80 (m, 1H), 4.50 (d, J = 15.4 Hz, 1H), 3.89-3.85 (m, 1H), 3.73 (s, 3H), 3.55-3.50 (m, 1H), 3.22-3.16 (m, 5H) 33

434 ¹H NMR (500 MHz, CD₃OD) δ 7.83 (d, J = 7.6 Hz, 1H), 7.68 (d, J = 8.3 Hz, 1H), 7.50-7.46 (m, 3H), 7.44-7.42 (m, 2H), 7.08 (dd, J = 8.3, 1.8 Hz, 1H), 6.41 (dd, J = 7.6, 2.6 Hz, 1H), 6.21 (d, J = 2.6 Hz, 1H), 5.21 (s, 2H), 4.86-4.84 (m, 1H), 4.49 (d, J = 15.4 Hz, 1H), 3.88-3.84 (m, 1H), 3.72 (s, 3H), 3.55-3.50 (m, 1H), 3.21-3.16 (m, 5H) 34

401 ¹H NMR (500 MHz, CD₃OD) δ 8.90 (dd, J = 5.8, 1.8 Hz, 1H), 8.65 (overlapping ddd, J = 7.9, 1.6 Hz, 1H), 8.20 (d, J = 8.0 Hz, 1H), 8.07 (overlapping dd, J = 6.4 Hz, 1H), 7.70 (d, J = 7.6 Hz, 1H), 7.65 (d, J = 6.4 Hz, 1H), 7.49 (d, J = 1.7 Hz, 1H), 7.07 (dd, J = 6.8, 1.8 Hz, 1H), 6.63 (dd, J = 7.6, 2.7 Hz, 1H), 6.21 (d, J = 2.7 Hz, 1H), 5.59 (s, 2H), 4.80 (m, 1H), 4.50 (d, J = 15.3 Hz, 1H), 3.88-3.85 (m, 1H), 3.73 (s, 3H), 3.55-3.50 (m, 1H), 3.21-3.16 (m, 5H) 35

421 ¹H NMR (500 MHz, CD₃OD) δ 8.61 (s, 1H), 7.77 (dd, J = 8.3, 3.8 Hz, 1H), 7.64-7.62 (m, 3H), 7.47 (d, J = 1.6 Hz, 1H), 7.03 (dd, J = 8.4, 1.8 Hz, 1H), 6.37 (dd, J = 7.6, 3.8 Hz, 1H), 6.15 (d, J = 2.7 Hz, 1H), 5.28 (s, 2H), 4.54 (s, 2H), 3.71 (s, 3H), 3.60 (t, J = 6.1 Hz, 2H), 3.12 (t, J = 6.0 Hz, 2H) 36

435 ¹H NMR (500 MHz, CD₃OD) δ 8.68 (br s, 1H), 8.05 (dd, J = 8.0, 2.4 Hz, 1H), 7.76 (d, J = 8.4 Hz, 1H), 7.71 (d, J = 8.4 Hz, 1H), 7.65 (d, J = 8.3 Hz, 1H), 7.51 (d, J = 1.6 Hz, 1H), 7.09 (dd, J = 8.3, 1.8 Hz, 1H), 6.53 (dd, J = 7.6, 1.7 Hz, 1H), 6.28 (d, J = 1.6 Hz, 1H), 5.36 (s, 2H), 4.85-4.80 (m, 1H), 4.49 (d, J = 15.3 Hz, 1H), 3.89-3.84 (m, 1H), 3.72 (s, 3H), 3.53-3.47 (m, 1H), 3.22-3.19 (m, 2H), 3.16 (s, 3H) 37

404 ¹H NMR (500 MHz, DMSO-d₆) δ 11.0 (br s, 1H), 7.83 (dd, J = 6.8, 1.9 Hz, 2H), 7.76 (d, J = 7.1 Hz, 1H), 7.62-7.57 (m, 4H), 7.07 (dd, J = 8.3, 1.8 Hz, 1H), 6.81 (d, J = 2.0 Hz, 1H), 6.69 (dd, J = 7.2, 2.1 Hz, 1H), 4.79 (d, J = 15.2 Hz, 1H), 4.44 (dd, J = 15.2, 6.0 Hz, 1H), 3.74-3.68 (m, 4H), 3.48- 3.38 (m, 1H), 3.10-2.99 (m, 5H) 38

390 ¹H NMR (500 MHz, CD₃OD) δ 7.78-7.75 (m, 3H), 7.67 (d, J = 8.3 Hz, 1H), 7.55-7.53 (m, 3H), 7.13 (dd, J = 8.3, 1.8 Hz, 1H), 6.91 (d, J = 1.9 Hz, 1H), 6.84 (dd, J = 7.1, 2.0 Hz, 1H), 4.56 (s, 2H), 3.74 (s, 3H), 3.61 (t, J = 6.0 Hz, 2H), 3.14 (t, J = 6.0 Hz, 2H) 39

424 ¹H NMR (300 MHz, CD₃OD) δ 7.97 (d, J = 8.1 Hz, 2H), 7.87-7.80 (m, 3H), 7.68 (d, J = 8.2 Hz, 1H), 7.57 (d, J = 1.5 Hz, 1H), 7.14 (dd, J = 8.3, 1.8 Hz, 1H), 6.96 (d, J = 1.8 Hz, 1H), 6.87 (dd, J = 7.2, 1.8 Hz, 1H), 4.56 (s, 2H), 3.74 (s, 3H), 3.61 (t, J = 6.0 Hz, 2H), 3.14 (t, J = 6.0 Hz, 2H) 40

438 ¹H NMR (500 MHz, CD₃OD) δ 7.96 (d, J = 8.2 Hz, 2H), 7.85-7.83 (m, 3H), 7.68 (d, J = 8.3 Hz, 1H), 7.58 (d, J = 1.6 Hz, 1H), 7.16 (dd, J = 8.3, 1.7 Hz, 1H), 6.98 (d, J = 1.8 Hz, 1H), 6.90 (dd, J = 7.1, 1.9 Hz, 1H), 4.87-4.86 (m, 1H), 4.51 (d, J = 15.3 Hz, 1H), 3.90-3.86 (m, 1H), 3.74 (s, 3H), 3.57-3.51 (m, 1H), 3.23-3.20 (m, 2H), 3.17 (s, 3H) 41

438 ¹H NMR (500 MHz, CD₃OD) δ 7.77 (d, J = 7.0 Hz, 1H), 7.68 (d, J = 8.4 Hz, 1H), 7.65 (overlapping dd, J = 1.1 Hz, 1H), 7.58 (d, J = 1.7 Hz, 1H), 7.49 (s, 2H), 7.16 (dd, J = 8.3, 1.8 Hz, 1H), 6.70 (d, J = 1.5 Hz, 1H), 6.62 (dd, J = 7.0, 1.9 Hz, 1H), 4.86 (m, 1H), 4.50 (d, J = 15.3 Hz, 1H), 3.89-3.85 (m, 1H), 3.74 (s, 3H), 3.56-3.55 (m, 1H), 3.23-3.20 (m, 2H), 3.16 (s, 3H) 42

386 ¹H NMR (500 MHz, DMSO-d₆) δ 9.71 (br s, 2H), 7.56 (d, J = 7.6 Hz, 1H), 7.54 (d, J = 8.3 Hz, 1H), 7.50-7.47 (m, 3H), 7.44-7.41 (m, 2H), 7.38-7.37 (m, 1H), 6.99 (dd, J = 8.3, 1.8 Hz, 1H), 6.11 (dd, J = 7.6, 2.8 Hz, 1H), 5.97 (d, J = 2.6 Hz, 1H), 5.15 (s, 2H), 4.45 (s, 2H), 3.81 (s, 3H), 3.42-3.41 (m, 2H), 2.98-2.97 (m, 2H) 43

430 ¹H NMR (500 MHz, CD₃OD) δ 7.63 (d, J = 8.4 Hz, 1H), 7.61 (d, J = 7.5 Hz, 1H), 7.47-7.46 (m, 3H), 7.42-7.39 (m, 2H), 7.36 (d, J = 7.1 Hz, 1H), 7.06 (dd, J = 8.3, 1.8 Hz, 1H), 6.33 (dd, J = 7.6, 2.6 Hz, 1H), 6.15 (d, J = 2.6 Hz, 1H), 5.19 (s, 2H), 4.81-4.79 (m, 1H), 4.59 (d, J = 15.3 Hz, 1H), 4.01 (t, J = 5.1 Hz, 2H), 3.97-3.94 (m, 1H), 3.73 (s, 3H), 3.58-3.50 (m, 3H), 3.21-3.16 (m, 2H) 44

497 ¹H NMR (500 MHz, CD₃OD) δ 7.86 (d, J = 7.5 Hz, 1H), 7.62 (dd, J = 8.2, 2.7 Hz, 1H), 7.51-7.50 (m, 3H), 7.46-7.43 (m, 2H), 7.41-7.40 (m, 1H), 7.08-7.06 (m, 1H), 6.63 (dd, J = 7.8, 2.6 Hz, 1H), 6.40 (d, J = 1.4 Hz, 1H), 5.31 (s, 2H), 4.93 (s, 1.3H), 4.77 (s, 0.7H), 4.56-4.55 (m, 2H), 4.04- 4.02 (m, 0.6H), 3.81-3.78 (m, 3.4H), 3.76 (s, 3H), 3.24-3.19 (m, 2H), 2.79-2.97 (m, 1.3H), 2.92- 2.85 (m, 0.7H), 2.22-2.19 (m, 2H), 2.11-2.19 (m, 2H) 45

483 ¹H NMR (500 MHz, CD₃OD) δ 7.79 (dd, J = 7.5, 1.4 Hz, 1H), 7.47 (d, J = 8.3 Hz, 1H), 7.49-7.46 (m, 3H), 7.44-7.46 (m, 2H), 7.39-7.36 (m, 1H), 7.04 (dd, J = 8.3, 1.6 Hz, 1H), 6.57-6.55 (m, 1H), 6.34 (d, J = 2.5 Hz, 1H), 5.27 (s, 2H), 4.96-4.87 (m, 2H), 3.90-8.86 (m, 2H), 3.77 (s, 3H), 3.48- 3.34 (m, 3H), 3.00-2.86 (m, 2H), 2.67-2.61 (m, 1H), 2.17-2.02 (m, 3H) 46

386 ¹H NMR (500 MHz, CD₃OD) δ 7.66 (d, J = 7.5 Hz, 1H), 7.57-7.52 (m, 2H), 7.46 (d, J = 7.7 Hz, 2H), 7.41 (overlapping dd, J = 7.3 Hz, 2H), 7.36 (d, J = 7.5 Hz, 1H), 7.19 (dd, J = 8.6, 2.0 Hz, 1H), 6.42 (dd, J = 7.5, 2.7 Hz, 1H), 6.22 (d, J = 2.6 Hz, 1H), 5.22 (s, 2H), 4.55 (s, 2H), 3.75 (s, 3H), 3.58 (t, J = 6.0 Hz, 2H), 3.10 (t, J = 6.0 Hz, 2H) 47

400 ¹H NMR (500 MHz, CD₃OD) δ 7.56-7.53 (m, 2H), 7.51 (d, J = 1.8, 1H), 7.46 (d, J = 7.3 Hz, 2H), 7.41 (overlapping dd, J = 7.4 Hz, 2H), 7.36 (d, J = 7.2 Hz, 1H), 7.19 (dd, J = 8.6, 2.0 Hz, 1H), 6.27 (dd, J = 7.6, 2.7 Hz, 1H), 6.11 (d, J = 2.6 Hz, 1H), 5.18 (s, 2H), 4.64 (br s, 2H), 3.75 (s, 3H), 3.67 (br s, 2H), 3.18-3.13 (m, 5H) 48

425 ¹H NMR (500 MHz, CD₃OD) δ 9.06 (s, 1H), 8.28 (dd, J = 8.4, 2.1 Hz, 1H), 8.23 (d, J = 8.2 Hz, 1H), 7.87 (d, J = 7.1 Hz, 1H), 7.64 (d, J = 8.3 Hz, 1H), 7.58 (d, J = 1.6 Hz, 1H), 7.43 (d, J = 1.6 Hz, 1H), 7.29 (dd, J = Hz, 1H), 7.17 (dd, J = 8.3, 1.8 Hz, 1H), 4.50 (s, 2H), 3.76 (s, 3H), 3.69 (t, J = 6.0 Hz, 2H), 3.22 (t, J = Hz, 2H) 49

405 ¹H NMR (500 MHz, CD₃OD) δ 8.70 (s, 1H), 8.00 (dt, J = 8.4, 2.8 Hz, 1H), 7.91-7.88 (m, 2H), 7.63 (d, J = 8.4 Hz, 1H), 7.55 (s, 1H), 7.11 (dd, J = 8.3, 1.7 Hz, 1H), 6.69 (dd, J = 7.5, 2.7 Hz, 1H), 6.45 (d, J = 2.6 Hz, 1H), 5.46 (s, 2H), 4.49 (s, 2H), 3.75 (s, 3H), 3.68 (t, J = 6.1 Hz, 2H), 3.22 (t, J = 6.1 Hz, 2H) 50

426 ¹H NMR (500 MHz, CD₃OD) δ 8.54 (d, J = 8.8 Hz, 1H), 8.28 (d, J = 8.9 Hz, 1H), 7.91 (d, J = 7.0 Hz, 1H), 7.64 (d, J = 8.4 Hz, 1H), 7.60 (d, J = 1.5 Hz, 1H), 7.44 (d, J = 1.5 Hz, 1H), 7.35 (dd, J = 7.2, 1.9 Hz, 1H), 7.16 (dd, J = 8.3, 1.8 Hz, 1H), 4.50 (s, 2H), 3.77 (s, 3H), 3.69 (t, J = 6.1 Hz, 2H), 3.22 (t, J = 6.0 Hz, 2H) 51

421 ¹H NMR (300 MHz, CD₃OD) δ 8.61 (d, J = 2.1 Hz, 1H), 7.95 (dd, J = 8.4, 2.4 Hz, 1H), 7.62 (d, J = 7.6 Hz, 2H), 7.58 (d, J = 8.4 Hz, 1H), 7.47 (d, J = 1.6 Hz, 1H), 7.05 (dd, J = 8.3, 1.8 Hz, 1H), 6.36 (dd, J = 7.6, 2.2 Hz, 1H), 6.13 (d, J = 2.6 Hz, 1H), 5.28 (s, 2H), 4.48 (s, 2H), 3.73 (s, 3H), 3.67 (t, J = 6.2 Hz, 2H), 3.02 (t, J = 6.2 Hz, 2H) 52

435 ¹H NMR (300 MHz, CD₃OD) δ 8.60 (d, J = 2.0 Hz, 1H), 7.96-7.92 (m, 1H), 7.61 (d, J = 7.7 Hz, 2H), 7.57 (d, J = 8.3 Hz, 1H), 7.47 (d, J = 1.4 Hz, 1H), 7.06 (dd, J = 8.4, 1.7 Hz, 1H), 6.34 (dd, J = 7.6, 2.6 Hz, 1H), 6.12 (d, J = 2.6 Hz, 1H), 5.27 (s, 2H), 4.75 (d, J = 14.2 Hz, 1H), 4.38 (d, J = 14.1 Hz, 1H), 3.95-3.85 (m, 1H), 3.73 (s, 3H), 3.63 (m, 1H), 3.31 (m overlapping with solvent, 2H), 3.13 (s, 3H) 53

387 ¹H NMR (300 MHz, CDCl₃) δ 8.88 (d, J = 5.2 Hz, 1H), 8.59 (dd, J = 7.9, 1.5 Hz, 1H), 8.15 (d, J = 8.0 Hz, 1H), 8.01 (overlapping dd, J = 6.6 Hz, 1H), 7.69 (d, J = 7.6 Hz, 1H), 7.60 (d, J = 8.4 Hz, 1H), 7.48 (d, J = 1.6 Hz, 1H), 7.06 (dd, J = 8.4, 1.8 Hz, 1H), 6.44 (dd, J = 7.6, 2.7 Hz, 1H), 6.21 (d, J = 2.7 Hz, 1H), 5.57 (s, 2H), 4.48 (s, 2H), 3.74 (s, 3H), 3.68 (t, J = 6.2 Hz, 2H), 3.21 (t, J = 6.2 Hz, 2H) 54

401 ¹H NMR (500 MHz, CD₃OD) δ 8.87 (d, J = 5.7 Hz, 1H), 8.58 (overlapping dd, J = 8.2 Hz, 1H), 8.14 (d, J = 7.9 Hz, 1H), 8.00 (overlapping dd, J = 6.6 Hz, 1H), 7.69 (d, J = 7.6 Hz, 1H), 7.59 (d, J = 8.3 Hz, 1H), 7.49 (s, 1H), 7.07 (dd, J = 8.3, 1.7 Hz, 1H), 6.44 (dd, J = 7.5, 2.6 Hz, 1H), 6.20 (d, J = 2.0 Hz, 1H), 5.56 (s, 2H), 4.76 (d, J = 14.2 Hz, 1H), 4.40 (d, J = 14.2 Hz, 1H), 3.91 (m, 1H), 3.74 (s, 3H), 3.61 (m, 1H), 3.29-3.17 (m overlapping with solvent, 2H), 3.13 (s, 3H) 55

387 ¹H NMR (500 MHz, CD₃OD) δ 8.89 (d, J = 5.4 Hz, 1H), 8.61 (overlapping ddd, J = 8.0, 1.6 Hz, 1H), 8.16 (d, J = 8.0 Hz, 1H), 8.02 (overlapping dd, J = 6.6 Hz, 1H), 7.70 (d, J = 7.6 Hz, 1H), 7.63 (d, J = 8.4 Hz, 1H), 7.47 (d, J = 1.6 Hz, 1H), 7.06 (dd, J = 8.4, 1.8 Hz, 1H), 6.44 (dd, J = 7.6, 2.7 Hz, 1H), 6.21 (d, J = 2.6 Hz, 1H), 5.57 (s, 2H), 4.56 (s, 2H), 3.73 (s, 3H), 3.60 (t, J = 6.0, 2H), 3.13 (t, J = 6.0, 2H) 56

384 ¹H NMR (300 MHz, DMSO-d₆) δ 9.67 (s, 2H), 7.59-7.52 (m, 3H), 7.35-7.27 (m, 4H), 7.24-7.17 (m, 1H), 7.01 (dd, J = 7.4, 2.0 Hz, 1H), 6.38-6.27 (m, 2H), 4.45 (s, 2H), 3.67 (s, 3H), 3.42 (t, J = 6.4 Hz, 2H), 2.97-2.89 (m, 4H), 2.81-2.76 (m, 2H) 57

391 ¹H NMR (500 MHz, CD₃OD) δ 8.74 (d, J = 2.4 Hz, 1H), 8.06 (d, J = 8.5 Hz, 1H), 8.02 (dd, J = 8.7, 2.4 Hz, 1H), 7.86 (d, J = 7.2 Hz, 1H), 7.64 (d, J = 8.3 Hz, 1H), 7.58 (d, J = 1.9 Hz, 1H), 7.37 (d, J = 1.5 Hz, 1H), 7.27 (dd, J = 8.5, 1.8 Hz, 1H), 7.15 (dd, J = 8.4, 1.8 Hz, 1H), 4.50 (s, 2H), 3.75 (s, 3H), 3.68 (t, J = 6.5 Hz, 2H), 3.22 (t, J = 6.5 Hz, 2H) 59

419 ¹H NMR (500 MHz, CD₃OD) δ 8.65 (d, J = 2.6 Hz, 1H), 7.91 (overlapping ddd, J = 9.6, 2.1 Hz, 1H), 7.83-7.20 (m, 2H), 7.61 (d, J = 8.4 Hz, 1H), 7.53 (d, J = 1.8 Hz, 1H), 7.09 (dd, J = 8.4, 1.8 Hz, 1H), 6.59 (dd, J = 7.5, 2.6 Hz, 1H), 6.36 (d, J = 2.6 Hz, 1H), 5.41 (s, 2H), 4.76 (d, J = 14.2 Hz, 1H), 4.39 (d, J = 14.2 Hz, 1H), 3.94-3.82 (m, 2H), 3.74 (s, 3H), 3.65-3.58 (m, 2H), 3.13 (s, 3H) 60

405 ¹H NMR (500 MHz, CD₃OD) δ 8.72 (d, J = 1.7 Hz, 1H), 8.03 (d, J = 7.9 Hz, 1H), 7.99 (dd, J = 8.2, 2.2 Hz, 1H), 7.79 (d, J = 7.1 Hz, 1H), 7.61 (d, J = 8.3 Hz, 1H), 7.56 (d, J = 1.3 Hz, 1H), 7.34 (d, J = 1.5 Hz, 1H), 7.19 (dd, J = 7.2, 1.8 Hz, 1H), 7.14 (dd, J = 8.3, 1.8 Hz, 1H), 4.80-4.72 (br m, 1H), 4.46-4.34 (m, 1H), 3.96-3.86 (m, 1H), 3.75 (s, 3H), 3.65-3.55 (br m, 1H), 3.28 (s, 2H), 3.14 (s, 3H) 61

483 ¹H NMR (300 MHz, D₂O) δ 7.50 (d, J = 8.3 Hz, 1H), 7.46 (d, J = 7.7 Hz, 1H), 7.42-7.31 (m, 6H), 6.96 (dd, J = 8.3, 1.6 Hz, 1H), 6.27 (dd, J = 7.7, 2.6 Hz, 1H), 6.10 (d, J = 2.6 Hz, 1H), 5.90 (s, 2H), 4.59 (br s, 2H), 3.81-3.59 (m, 8H), 3.55 (s, 3H), 3.20 (t, J = 5.7 Hz, 2H), 3.18-3.05 (br m, 2H), 2.15-1.90 (m, 4H) 62

439 ¹H NMR (500 MHz, CD₃OD) δ 9.04 (s, 1H), 8.28 (dd, J = 8.7, 1.9 Hz, 1H), 8.21 (d, J = 2.1 Hz, 1H), 7.83 (d, J = 7.1 Hz, 1H), 7.62 (d, J = 8.3 Hz, 1H), 7.58 (d, J = 1.3 Hz, 1H), 7.39 (d, J = 1.6 Hz, 1H), 7.24 (dd, J = 7.1, 1.9 Hz, 1H), 7.15 (dd, J = 8.3, 1.7 Hz, 1H), 4.80-4.71 (br m, 1H), 4.44-4.35 (br m, 1H), 3.96-3.86 (br m, 1H), 3.75 (s, 3H), 3.67- 3.57 (br m, 1H), 3.28 (s, 2H), 3.14 (s, 3H) 63

372 ¹H NMR (500 MHz, CD₃OD) δ 8.47 (d, J = 8.8 Hz, 1H), 8.03 (d, J = 8.8 Hz, 1H), 7.89 (d, J = 7.4 Hz, 1H), 7.64 (d, J = 8.4 Hz, 1H), 7.58 (d, J = 1.6 Hz, 1H), 7.35 (d, J = 1.6 Hz, 1H), 7.25 (dd, J = 7.1, 1.9 Hz, 1H), 7.15 (dd, J = 8.3, 1.9 Hz, 1H), 4.49 (s, 2H), 3.75 (s, 3H), 3.68 (t, J = 6.2 Hz, 2H), 3.24 (t, J = 6.2 Hz, 2H), 2.85 (s, 3H) 64

386 ¹H NMR (300 MHz, DMSO-d₆) δ 10.9 (s, 1H), 8.32 (d, J = 8.8 Hz, 1H), 7.85 (d, J = 7.2 Hz, 1H), 7.79 (d, J = 8.8 Hz, 1H), 7.64 (d, J = 1.5 Hz, 1H), 7.56 (d, J = 8.3 Hz, 1H), 7.25 (d, J = 1.7 Hz, 1H), 7.14-7.11 (m, 2H), 4.65 (d, J = 12.1 Hz, 1H), 4.31 (dd, J = 14.2, 7.5 Hz, 1H), 3.81-3.74 (m, 1H), 3.71 (s, 3H), 3.55-3.45 (m, 1H), 3.26-3.15 (m, 2H), 2.98 (s, 3H), 2.72 (s, 3H) 65

404 ¹H NMR (300 MHz, DMSO-d₆) δ 9.56 (br s, 2H), 7.64 (d, J = 7.1 Hz, 1H), 7.62-7.55 (m, 2H), 7.47 (dd, J = 8.4, 6.9 Hz, 1H), 7.12-7.06 (m, 2H), 6.90 (overlapping ddd, J = 8.4, 2.4 Hz, 1H), 6.55 (d, J = 1.6 Hz, 1H), 6.47 (dd, J = 7.1, 1.8 Hz, 1H), 4.37-4.30 (br m, 2H), 3.81 (s, 3H), 3.69 (s, 3H), 3.56-3.45 (br m, 2H), 3.10 (t, J = 5.5 Hz, 2H) 66

418 ¹H NMR (300 MHz, DMSO-d₆) δ 10.83 (br s, 1H), 7.65 (d, J = 7.1 Hz, 1H), 7.61 (d, J = 1.4 Hz, 1H), 7.54 (d, J = 8.3 Hz, 1H), 7.46 (dd, J = 8.4, 6.9 Hz, 1H), 7.12-7.10 (m, 1H), 7.08 (d, J = 1.4 Hz, 1H), 6.91 (overlapping ddd, J = 8.4, 2.4 Hz, 1H), 6.55 (d, J = 1.6 Hz, 1H), 6.48 (dd, J = 7.1, 1.6 Hz, 1H), 4.62 (d, J = 12.2 Hz, 1H), 4.30 (dd, J = 14.2, 7.5 Hz, 1H), 3.86 (s, 3H), 3.80-3.76 (m, 1H), 3.75 (s, 3H), 3.52-3.42 (m, 1H), 3.24-3.15 (m, 2H), 2.79 (d, J = 4.6 Hz, 3H) 67

469 ¹H NMR (500 MHz, D₂O) δ 7.56-7.53 (m, 2H), 7.48-7.40 (m, 6H), 7.02 (dd, J = 8.4, 1.4 Hz, 1H), 6.33 (dd, J = 7.5, 2.4 Hz, 1H), 6.17 (d, J = 2.4 Hz, 1H), 5.16 (s, 2H), 4.63 (br s, 2H), 4.09-3.79 (br m, 2H), 3.69-3.53 (m, 6H), 3.26-3.23 (m, 2H), 3.14 (t, J 12.8 Hz, 2H), 2.49 (d, J = 1.3 Hz, 2H), 2.16-2.04 (m, 2H) 68

483 ¹H NMR (500 MHz, D₂O) δ 7.56-7.52 (m, 2H), 7.48-7.38 (m, 6H), 7.02 (dd, J = 8.3, 1.6 Hz, 1H), 6.33 (dd, J = 7.5, 2.6 Hz, 1H), 6.16 (d, J = 2.5 Hz, 1H), 5.16 (s, 2H), 4.63 (s, 2H), 3.85-3.83 (m, 2H), 3.74-3.71 (m, 2H), 3.62 (s, 3H), 3.26-3.14 (m, 5H), 2.89 (s, 3H), 2.55-2.50 (m, 2H), 2.19- 2.12 (m, 2H) 69

425 ¹H NMR (300 MHz, CD₃OD) δ 9.10 (d, J = 2.0 Hz, 1H), 8.41 (dd, J = 8.2, 1.7 Hz, 1H), 7.98 (d, J = 8.2 Hz, 1H), 7.85 (d, J = 7.2 Hz, 1H), 7.61 (d, J = 8.2 Hz, 1H), 7.57 (d, J = 1.6 Hz, 1H), 7.14 (dd, J = 8.3, 1.9 Hz, 1H), 7.02 (d, J = 1.6 Hz, 1H), 6.89 (dd, J = 7.1, 2.0 Hz, 1H), 4.49 (s, 2H), 3.76 (s, 3H), 3.68 (t, J = 6.2 Hz, 2H), 3.22 (t, J = 6.2 Hz, 2H) 70

439 ¹H NMR (500 MHz, CD₃OD) δ 9.09 (d, J = 1.7 Hz, 1H), 8.42 (dd, J = 8.1, 2.0 Hz, 1H), 7.97 (d, J = 8.2 Hz, 1H), 7.85 (d, J = 7.1 Hz, 1H), 7.62 (d, J = 8.3 Hz, 1H), 7.58 (d, J = 1.5 Hz, 1H), 7.15 (dd, J = 8.3, 1.8 Hz, 1H), 7.02 (d, J = 1.8 Hz, 1H), 6.89 (dd, J = 7.1, 2.0 Hz, 1H), 4.79-4.37 (br m, 2H), 3.90-3.60 (br m, 5H), 3.30 (br m, 2H), 3.14 (s, 3H) 71

411 ¹H NMR (500 MHz, CD₃OD) δ 9.04 (s, 1H), 8.28 (dd, J = 8.3, 2.2 Hz, 1H), 8.22 (d, J = 8.2 Hz, 1H), 7.81 (d, J = 7.0 Hz, 1H), 7.62 (d, J = 8.3 Hz, 1H), 7.46 (d, J = 1.8 Hz, 1H), 7.38 (d, J = 1.8 Hz, 1H), 7.24 (dd, J = 7.1, 2.0 Hz, 1H), 7.11 (dd, J = 8.3, 2.0 Hz, 1H), 4.49 (s, 2H), 3.65 (t, J = 6.2 Hz, 2H), 3.21 (t, J = 6.2 Hz, 2H) 72

412 ¹H NMR (300 MHz, CD₃OD) δ 8.52 (d, J = 8.9 Hz, 1H), 8.28 (d, J = 8.9 Hz, 1H), 7.89 (d, J = 7.2 Hz, 1H), 7.62 (d, J = 8.3 Hz, 1H), 7.48 (d, J = 1.5 Hz, 1H), 7.43 (d, J = 1.5 Hz, 1H), 7.33 (dd, J = 7.2, 2.0 Hz, 1H), 7.14 (dd, J = 7.4, 2.0 Hz, 1H), 4.49 (s, 2H), 3.65 (t, J = 6.2 Hz, 2H), 3.21 (t, J = 6.2 Hz, 2H) 73

426 ¹H NMR (500 MHz, DMSO-d₆) δ 9.51 (s, 2H), 9.37 (br s, 2H), 7.90 (d, J = 7.2 Hz, 1H), 7.62- 7.60 (m, 2H), 7.13 (d, J = 1.9 Hz, 1H), 7.10 (dd, J = 8.3, 1.7 Hz, 1H), 6.88 (dd, J = 7.1, 2.0 Hz, 1H), 4.38-4.34 (br m, 2H), 3.70 (s, 3H), 3.56-3.50 (br m, 2H), 3.11 (t, J = 5.8 Hz, 2H) 74

426 ¹H NMR (500 MHz, DMSO-d₆) δ 9.48 (s, 2H), 9.37 (br s, 2H), 7.89 (d, J = 7.2 Hz, 1H), 7.65 (d, J = 1.6 Hz, 1H), 7.61 (d, J = 8.3 Hz, 1H), 7.50 (d, J = 1.6 Hz, 1H), 7.21 (dd, J = 7.6, 1.9 Hz, 1H), 7.12 (dd, J = 8.3, 1.8 Hz, 1H), 4.41-4.31 (br m, 2H), 3.71 (s, 3H), 3.51-3.48 (br m, 2H), 3.10 (t, J = 5.6 Hz, 2H) 75

455 ¹H NMR (500 MHz, DMSO-d₆) δ 9.54 (br s, 2H), 8.89 (s, 1H), 8.19 (dd, J = 7.9, 1.4 Hz, 1H), 8.00 (d, J = 8.0 Hz, 1H), 7.60 (d, J = 7.6 Hz, 1H), 7.55 (d, J = 8.3 Hz, 1H), 7.50 (d, J = 1.7 Hz, 1H), 6.98 (dd, J = 8.3, 1.8 Hz, 1H), 6.15 (dd, J = 7.5, 2.7 Hz, 1H), 6.02 (d, J = 2.7 Hz, 1H), 5.35 (s, 2H), 4.35-4.30 (br m, 2H), 3.67 (s, 3H), 3.53-3.47 (br m, 2H), 3.09 (t, J = 5.8 Hz, 2H) 76

455 ¹H NMR (300 MHz, CD₃OD) δ 8.93 (s, 1H), 8.23 (dd, J = 8.2, 2.1 Hz, 1H), 7.82 (d, J = 8.2 Hz, 1H), 7.70 (d, J = 7.5 Hz, 1H), 7.59 (d, J = 8.3 Hz, 1H), 7.49 (d, J = 1.7 Hz, 1H), 7.06 (dd, J = 8.3, 1.8 Hz, 1H), 6.47 (dd, J = 7.5, 2.7 Hz, 1H), 6.20 (d, J = 2.6 Hz, 1H), 5.42 (s, 2H), 4.48 (s, 2H), 3.73 (s, 3H), 3.67 (t, J = 6.1 Hz, 2H), 3.20 (t, J = 6.1 Hz, 2H) 77

387 ¹H NMR (500 MHz, DMSO-d₆) δ 9.23 (s, 2H), 7.96 (d, J = 2.8 Hz, 1H), 7.59 (d, J = 1.6 Hz, 1H), 7.54 (d, J = 8.4 Hz, 1H), 7.51-7.48 (m, 2H), 7.46-7.42 (m, 2H), 7.40 (d, J = 7.5 Hz, 1H), 7.13 (dd, J = 8.4, 1.7 Hz, 1H), 6.51 (d, J = 2.8 Hz, 1H), 5.22 (s, 2H), 4.34 (s, 2H), 3.69 (s, 3H), 3.52 (t, J = 5.8 Hz, 2H), 3.09 (t, J = 5.8 Hz, 2H) 78

425 ¹H NMR (300 MHz, DMSO-d₆) δ 9.37 (s, 2H), 8.56 (d, J = 2.2 Hz, 1H), 8.13 (d, J = Hz, 2H), 7.93 (d, J = 8.2 Hz, 2H), 7.72 (d, J = 1.6 Hz, 1H), 7.61 (d, J = 8.4 Hz, 1H), 7.48 (d, J = 2.2 Hz, 1H), 7.25 (dd, J = 8.4, 1.8 Hz, 1H), 4.36 (s, 2H), 3.70 (s, 3H), 3.58-3.48 (br m, 2H), 3.11 (t, J = 5.7 Hz, 2H) 79

391 ¹H NMR (500 MHz, CD₃OD) δ 8.73 (dd, J = 2.4, 0.6 Hz, 1H), 8.03 (dd, J = 8.5, 0.5 Hz, 1H), 8.00 (dd, J = 8.5, 2.4 Hz, 1H), 7.80 (d, J = 7.1 Hz, 1H), 7.67 (d, J = 8.3 Hz, 1H), 7.56 (d, J = 1.7 Hz, 1H), 7.31 (d, J = 1.7 Hz, 1H), 7.19 (dd, J = 7.1, 2.0 Hz, 1H), 7.14 (dd, J = 8.4, 1.8 Hz, 1H), 4.56 (s, 2H), 3.74 (s, 3H), 3.61 (t, J = 6.1 Hz, 2H), 3.14 (t, J = 6.1 Hz, 2H) 80

405 ¹H NMR (500 MHz, CD₃OD) δ 8.73 (d, J = 2.3 Hz, 1H), 8.03 (d, J = 8.5 Hz, 1H) 7.99 (dd, J = 8.5, 2.3 Hz, 1H), 7.79 (d, J = 7.2 Hz, 1H), 7.67 (d, J = 8.3 Hz, 1H), 7.57 (s, 1H), 7.31 (d, J = 1.6 Hz, 1H), 7.19 (dd, J = 7.1, 1.8 Hz, 1H), 7.15 (dd, J = 8.3, 1.7 Hz, 1H), 4.65 (br s, 2H), 3.74 (m, 5H), 3.21 (t, J = 5.7 Hz, 2H), 3.17 (s, 3H) 81

425 ¹H NMR (500 MHz, CD₃OD) δ 9.05 (s, 1H), 8.28 (dd, J = 8.3, 2.2 Hz, 1H), 8.22 (d, J = 8.3, Hz, 1H), 7.84 (d, J = 7.1 Hz, 1H), 7.67 (d, J = 8.4 Hz, 1H), 7.58 (d, J = 1.8 Hz, 1H), 7.40 (d, J = 1.8 Hz, 1H), 7.25 (dd, J = 7.2, 2.0 Hz, 1H), 7.15 (dd, J = 8.4, 1.8 Hz, 1H), 4.57 (s, 2H), 3.74 (s, 3H), 3.62 (t, J = 6.1 Hz, 2H), 3.15 (t, J = 5.9 Hz, 2H) 82

439 ¹H NMR (500 MHz, CD₃OD) δ 9.05 (s, 1H), 8.28 (dd, J = 8.3, 2.1 Hz, 1H) 8.22 (d, J = 8.4, Hz, 1H), 7.84 (d, J = 7.1 Hz, 1H), 7.68 (d, J = 8.3 Hz, 1H), 7.59 (d, J = 1.6, 1H), 7.40 (d, J = 1.7 Hz, 1H), 7.25 (dd, J = 7.2, 1.9 Hz, 1H), 7.16 (dd, J = 8.3, 1.8 Hz, 1H), 4.87 (s, 1H), 4.51 (s, 1H), 3.87 (s, 1H), 3.75 (br s, 3H), 3.55 (br s, 1H), 3.21-3.17 (m, 5H) 84

405 ¹H NMR (500 MHz, CD₃OD) δ 8.51 (s, 1H), 7.72-7.59 (m, 4H), 7.46 (d, J = 1.0 Hz, 1H), 7.05 (dd, J = 8.3, 1.5 Hz, 1H), 6.32 (dd, J = 7.6, 2.6 Hz, 1H), 7.05 (d, J = 2.6 Hz, 1H), 5.26 (s, 2H), 4.54 (s, 2H), 3.71 (s, 3H), 3.60 (t, J = 6.0 Hz, 2H), 3.12 (t, J = 5.8 Hz, 2H) 85

419 ¹H NMR (500 MHz, CD₃OD) δ 8.51 (d, J = 2.6 Hz, 1H), 7.72-7.59 (m, 4H), 7.47 (s, 1H), 7.06 (dd, J = 8.3, 1.7 Hz, 1H), 6.32 (dd, J = 7.6, 2.6 Hz, 1H), 6.13 (d, J = 2.6 Hz, 1H), 5.26 (s, 2H), 4.68 (m, 2H), 3.71 (m, 5H), 3.18 (t, J = 5.9 Hz, 2H), 3.15 (s, 3H) 86

425 ¹H NMR (500 MHz, CD₃OD) δ 9.10 (d, J = 1.9 Hz, 1H), 8.41 (dd, J = 8.2, 2.2 Hz, 1H), 7.97 (d, J = 8.3 Hz, 1H), 7.85 (d, J = 7.0 Hz, 1H), 7.68 (d, J = 8.3 Hz, 1H), 7.57 (d, J = 1.7 Hz, 1H), 7.15 (dd, J = 8.3, 1.8 Hz, 1H), 7.03 (d, J = 1.8 Hz, 1H), 6.89 (dd, J = 7.1, 2.0 Hz, 1H), 4.57 (br m, 2H), 3.75 (s, 3H), 3.62 (br m, 2H), 3.15 (br m, 2H) 87

411 ¹H NMR (500 MHz, CD₃OD) δ 9.05 (s, 1H), 8.28 (dd, J = 8.4, 2.1 Hz, 1H), 8.22 (d, J = 8.4 Hz, 1H), 7.82 (d, J = 7.2 Hz, 1H), 7.66 (d, J = 8.4 Hz, 1H), 7.48 (d, J = 7.1 Hz, 1H), 7.39 (d, J = 1.7 Hz, 1H), 7.24 (dd, J = 7.2, 1.9 Hz, 1H), 7.13 (dd, J = 8.4, 1.8 Hz, 1H), 4.50 (s, 2H), 3.63 (t, J = 6.1 Hz, 2H), 3.14 (t, J = 6.1 Hz, 2H) 88

387 ¹H NMR (500 MHz, CD₃OD) δ 7.93 (d, J = 2.7 Hz, 1H), 7.59 (d, J = 8.4 Hz, 1H), 7.56 (d, J = 1.5 Hz, 1H), 7.50-7.48 (m, 2H), 7.43 (overlapping dd, J = 7.8 Hz, 2H), 7.39 (d, J = 1.7 Hz, 1H), 7.18 (dd, J = 8.4, 1.7 Hz, 1H), 6.48 (d, J = 2.7 Hz, 1H), 5.22 (s, 2H), 4.54 (s, 2H), 3.71 (s, 3H), 3.59 (t, J = 5.6 Hz, 2H), 3.12 (t, J = 5.9 Hz, 2H) 89

455 ¹H NMR (500 MHz, CD₃OD) δ 8.75 (s, 1H), 8.08 (d, J = 7.9 Hz, 1H), 7.79 (d, J = 8.1 Hz, 1H), 7.53 (dd, J = 7.9, 2.0 Hz, 2H), 7.38 (d, J = 1.7 Hz, 1H), 6.97 (dd, J = 8.4, 1.8 Hz, 1H), 6.25 (dd, J = 7.6, 2.7 Hz, 1H), 6.08 (d, J = 2.6 Hz, 1H), 5.26 (s, 2H), 4.46 (s, 2H), 3.63 (s, 3H), 3.51 (t, J = 6.1 Hz, 2H), 3.03 (t, J = 6.1 Hz, 2H) 90

371 ¹H NMR (500 MHz, CD₃OD) 8.59 (s, 1H), 7.95 (d, J = 8.1 Hz, 1H), 7.87 (d, J = 6.5 Hz, 1H), 7.80 (d, J = 7.0 Hz, 1H), 7.67 (d, J = 8.4 Hz, 1H), 7.56 (d, J = 1.4 Hz, 1H), 7.24 (d, J = 1.6 Hz, 1H), 7.15-7.12 (m, 2H), 4.57 (s, 2H), 3.74 (s, 3H), 3.61 (t, J = 6.0 Hz, 2H), 3.14 (t, J = 6.1 Hz, 2H), 2.46 (s, 3H) 91

371 ¹H NMR (500 MHz, CD₃OD) δ 8.76 (d, J = 1.8 Hz, 1H), 8.34 (d, J = 6.9 Hz, 1H), 8.24 (d, J = 8.2 Hz, 1H), 7.94 (d, J = 7.2 Hz, 1H), 7.67 (d, J = 8.3 Hz, 1H), 7.61 (d, J = 1.7 Hz, 1H), 7.23 (d, J = 1.8 Hz, 1H), 7.17 (dd, J = 8.3, 1.8 Hz, 1H), 7.04 (dd, J = 7.1, 2.1 Hz, 1H), 4.53 (s, 2H), 3.79 (s, 3H), 3.71 (t, J = 6.2 Hz, 2H), 3.25 (t, J = 6.2 Hz, 2H), 2.61 (s, 3H) 92

371 ¹H NMR (500 MHz, CD₃OD) δ 8.80 (d, J = 2.2 Hz, 1H), 8.12 (dd, J = 8.1, 2.5 Hz, 1H), 7.79 (d, J = 7.0 Hz, 1H), 7.59 (d, J = 8.3 Hz, 1H), 7.52 (d, J = 1.7 Hz, 1H), 7.47 (d, J = 8.2 Hz, 1H), 7.10 (dd, J = 8.3, 1.9 Hz, 1H), 6.93 (d, J = 1.8 Hz, 1H), 6.85 (dd, J = 7.1, 2.0 Hz, 1H), 4.34 (s, 2H), 3.73 (s, 3H), 3.52 (t, J = 6.1 Hz, 2H), 3.10 (t, J = 6.1 Hz, 2H), 2.62 (s, 3H) 93

371 ¹H NMR (500 MHz, CD₃OD) δ 8.80 (d, J = 8.1 Hz, 1H), 8.11 (dd, J = 8.2, 2.5 Hz, 1H), 7.79 (d, J = 7.0 Hz, 1H), 7.64 (d, J = 8.3 Hz, 1H), 7.52 (d, J = 1.7 Hz, 1H), 7.47 (d, J = 8.2 Hz, 1H), 7.11 (dd, J = 8.3, 1.8 Hz, 1H), 6.93 (d, J = 1.9 Hz, 1H), 6.85 (dd, J = 7.1, 2.0 Hz, 1H), 4.40 (s, 2H), 3.71 (s, 3H), 3.46 (t, J = 5.9 Hz, 2H), 3.04 (t, J = 5.9 Hz, 2H), 2.62 (s, 3H) 94

400 ¹H NMR (500 MHz, CD₃OD) δ 7.79 (d, J = 7.0 Hz, 1H), 7.66 (d, J = 8.0 Hz, 1H), 7.53 (s, 1H), 7.48-7.36 (m, 5H), 7.10 (d, J = 8.5 Hz, 1H), 6.55 (d, J = 6.5 Hz, 1H), 6.33 (s, 1H), 5.27 (s, 2H), 4.98 (q, J = 6.5 Hz, 1H), 3.76 (s, 3H), 3.67-3.59 (m, 2H), 3.13-3.08 (m, 2H), 1.76 (d, J = 7.0 Hz, 3H) 95

414 ¹H NMR (500 MHz, CD₃OD) δ 7.58-7.55 (m, 2H), 7.47-7.34 (m, 6H), 6.99 (d, J = 8.5, 1.0 Hz, 1H), 6.28 (dd, J = 7.5, 2.5 Hz, 1H), 6.11 (d, J = 2.5 Hz, 1H), 5.18 (s, 2H), 4.27 (q, J = 6.5 Hz, 1H), 3.69 (s, 3H), 3.36-3.33 (m, 1H), 3.10-2.96 (m, 2H), 2.84-2.80 (m, 1H), 2.65 (s, 3H), 1.51 (d, J = 6.5 Hz, 3H) 96

430 ¹H NMR (500 MHz, DMSO-d₆) δ 9.12 (s, 2H), 7.66 (d, J = 2.0 Hz, 1H), 7.59-7.56 (m, 2H), 7.49-7.37 (m, 5H), 7.08-7.05 (m, 1H), 6.14-6.12 (m, 1H), 5.99 (d, J = 2.5 Hz, 1H), 5.57 (s, 2H), 5.17 (s, 2H), 4.38 (m, 2H), 3.55 (m, 2H), 3.45- 3.40 (m, 2H), 3.13 (m, 2H), 1.08-1.05 (m, 3H) 97

356 ¹H NMR (500 MHz, DMSO-d₆) δ 9.26 (s, 2H), 7.79 (dd, J = 8.0, 1.5 Hz, 2H), 7.75 (d, J = 7.5 Hz, 1H), 7.62 (d, J = 1.5 Hz, 1H), 7.59 (d, J = 8.5 Hz, 1H), 7.55-7.50 (m, 3H), 7.10 (dd, J = 8.5, 2.0 Hz, 1H), 6.78 (d, J = 1.5 Hz, 1H), 6.70 (dd, J = 7.0, 2.0 Hz, 1H), 4.37 (m, 2H), 3.71 (s, 3H), 3.54- 3.53 (m, 2H), 3.10 (t, J = 6.0 Hz, 2H) 98

370 ¹H NMR (500 MHz, DMSO-d₆) δ 10.46 (s, 1H), 7.80-7.74 (m, 3H), 7.63 (s, 1H), 7.56-7.52 (m, 4H), 7.11 (d, J = 8.0 Hz, 1H), 6.78 (s, 1H), 6.70 (d, J = 7.0 Hz, 1H), 4.68-4.65 (m, 1H), 4.34- 4.30 (m, 1H), 3.82-3.79 (m, 1H), 3.71 (s, 3H), 3.53-3.51 (m, 1H), 3.20 (m, 2H), 3.00 (d, J = 4.0 Hz, 3H) 99

404 ¹H NMR (500 MHz, CD₃OD) δ 7.72 (d, J = 7.0 Hz, 1H), 7.63-7.56 (m, 3H), 7.14 (dd, J = 8.5, 1.5 Hz, 1H), 6.92 (dd, J = 8.5, 2.5 Hz, 1H), 6.87 (dd, J = 13.0, 2.5 Hz, 1H), 6.84 (s, 1H), 6.77-6.75 (m, 1H), 4.50 (s, 2H), 3.88 (s, 3H), 3.76 (s, 3H), 3.68 (t, J = 6.0 Hz, 2H), 3.22 (t, J = 6.0 Hz, 2H) 100

428 ¹H NMR (500 MHz, CDCl₃) δ 7.53-7.36 (m, 6H), 7.32-7.30 (m, 2H), 7.06-7.00 (m, 1H), 6.09 (d, J = 3.0 Hz, 1H), 6.07-6.04 (m, 1H), 5.06 (s, 2H), 4.82 (s, 1H), 4.67 (s, 1H), 4.03 (t, J = 5.5 Hz, 1H), 3.84 (t, J = 5.5 Hz, 1H), 3.64 (s, 3H), 2.90 (t, J = 5.5 Hz, 1H), 2.84 (t, J = 5.5 Hz, 1H), 2.24, 2.22 (2 × s, 3H) 101

447 ¹H NMR (500 MHz, CDCl₃) δ 8.50 (d, J = 1.5 Hz, 1H), 7.54-7.46 (m, 3H), 7.35 (d, J = 7.5 Hz, 1H), 7.32 (d, J = 2.0 Hz, 1H), 7.03 (ddd, J = 20, 8.0, 1.5 Hz, 1H), 6.15-6.08 (m, 2H), 5.18 (s, 2H), 4.83, 4.70 (2 × s, 2H), 4.04 (t, J = 5.5 Hz, 1H), 3.85 (t, J = 5.5 Hz, 1H), 3.65, 3.64 (2 × s, 3H), 2.91 (t, J = 5.5 Hz, 1H), 2.85 (t, J = 5.5 Hz, 1H), 2.23, 2.25 (2 × s, 3H) 102

392 ¹H NMR (500 MHz, CD₃OD) δ 7.67-7.65 (m, 2H), 7.50 (s, 1H), 7.09 (d, J = 8.5 Hz, 1H), 6.35 (d, J = 6.0 Hz, 1H), 6.10 (s, 1H), 4.58 (s, 2H), 3.92 (d, J = 5.5 Hz, 2H), 3.75 (s, 3H), 3.63 (t, J = 6.0 Hz, 2H), 3.15 (d, J = 6.0 Hz, 2H), 1.92-1.74 (m, 6H), 1.39-1.19 (m, 5H) 103

392 ¹H NMR (500 MHz, DMSO-d₆) δ 9.21 (s, 2H), 7.55 (d, J = 8.5 Hz, 1H), 7.52 (d, J = 7.5 Hz, 1H), 7.50 (s, 1H), 6.99 (dd, J = 8.5, 1.5 Hz, 1H), 6.04 (dd, J = 7.5, 2.5 Hz, 1H), 5.85 (d, J = 2.5 Hz, 1H), 4.35 (s, 2H), 3.82 (d, J = 6.0 Hz, 2H), 3.68 (s, 3H), 3.54-3.53 (m, 2H), 3.09 (t, J = 5.5 Hz, 2H), 1.80-1.65 (m, 6H), 1.30-1.01 (m, 5H) 104

406 ¹H NMR (500 MHz, DMSO-d₆) δ 10.53 (s, 1H), 7.53 (d, J = 7.5 Hz, 1H), 7.51 (d, J = 8.0 Hz, 1H), 7.50 (d, J = 1.5 Hz, 1H), 7.00 (dd, J = 8.5, 1.5 Hz, 1H), 6.04 (dd, J = 7.5, 2.5 Hz, 1H), 5.85 (d, J = 3.0 Hz, 1H), 4.64 (d, J = 13 Hz, 1H), 4.30 (dd, J = 14, 7.5 Hz, 1H), 3.82 (d, J = 6.0 Hz, 2H), 3.80- 3.78 (m, 1H), 3.69 (s, 3H), 3.51-3.47 (m, 1H), 3.18 (t, J = 5.5 Hz, 2H), 2.98 (d, J = 4.5 Hz, 3H), 1.80-1.65 (m, 6H), 1.30-1.01 (m, 5H) 105

416 ¹H NMR (500 MHz, DMSO-d₆) δ 9.48 (br s, 1H), 9.10 (br s, 1H), 7.56 (overlapping dd, J = 8.5 Hz, 2H), 7.52 (s, 1H), 7.49-7.41 (m, 4H), 7.40-7.36 (m, 1H), 7.01 (dd, J = 7.0, 1.5 Hz, 1H), 6.12 (dd, J = 7.5, 1.5 Hz, 1H), 5.98 (d, J = 1.5 Hz, 1H), 5.72 (t, J = 3.3 Hz, 1H), 5.16 (s, 2H), 4.89-4.82 (m, 1H), 4.07-4.01 (m, 1H), 3.80-3.71 (m, 1H), 3.72 (s, 3H), 3.61-3.50 (m, 1H), 3.49-3.43 (m, 1H), 3.02-2.94 (m, 2H) 106

372 ¹H NMR (500 MHz, DMSO-d₆) δ 11.22 (s, 1H), 9.29 (br s, 2H), 7.54 (dd, J = 12.0, 8.0 Hz, 2H), 7.50-7.41 (m, 4H), 7.40-7.33 (m, 2H), 6.96 (dd, J = 8.0, 1.5 Hz, 1H), 6.09 (dd, J = 7.5, 2.5 Hz, 1H), 5.97 (d, J = 2.5 Hz, 1H), 5.15 (s, 2H), 4.38 (s, 2H), 3.50-3.42 (m, 2H) 3.00-2.92 (m, 2H) 107

386 ¹H NMR (500 MHz, DMSO-d₆) δ 11.30 (s, 1H), 10.50-10.41 (m, 1H), 7.58-7.52 (m, 2H), 7.49- 7.40 (m, 4H), 7.39-7.35 (m, 2H), 6.96 (br d, J = 8.0 Hz, 1H), 6.09 (br d, J = 7.5 Hz, 1H), 5.97 (br s, 1H), 5.15 (s, 2H), 4.60 (br d, J = 15.0 Hz, 1H), 4.41 (dd, J = 15.0, 7.5 Hz, 1H), 3.78-3.71 (m, 1H), 3.45-3.38 (m, 1H), 3.09-2.98 (m, 5H) 108

410 ¹H NMR (500 MHz, DMSO-d₆) δ 11.28 (s, 1H), 9.21 (br s, 2H), 8.01 (d J = 8.3 Hz, 2H), 7.88 (d, J = 8.3 Hz, 2H), 7.80 (d, J = 7.0 Hz, 1H), 7.58 (d, J = 8.0 Hz, 1H), 7.49 (d, J = 1.5 Hz, 1H), 7.07 (dd, J = 8.0, 1.5 Hz, 1H), 6.87 (d, J = 2.0 Hz, 1H), 6.72 (dd, J = 7.0, 2.0 Hz, 1H), 4.40 (s, 2H), 3.52- 3.48 (m, 2H), 2.99 (t, J = 6.0 Hz, 2H) 109

424 ¹H NMR (500 MHz, DMSO-d₆) δ 11.36 (s, 1H), 10.35 (br s, 1H), 8.02 (d, J = 8.3 Hz, 2H), 7.88 (d, J = 8.3 Hz, 2H), 7.80 (d, J = 7.0 Hz, 1H), 7.59 (d, J = 8.0 Hz, 1H), 7.49 (br s, 1H), 7.07 (dd, J = 8.0, 1.5 Hz, 1H), 6.87 (d, J = 1.5 Hz, 1H), 6.72 (d, J = 7.0, 1.5 Hz, 1H), 4.62 (br d, J = 16.0 Hz, 1H), 4.49-4.40 (m, 1H), 3.81-3.73 (m, 1H), 3.49-3.39 (m, 1H), 3.12-3.00 (m, 5H) 110

414 ¹H NMR (500 MHz, DMSO-d₆) δ 9.59 (s, 2H), 7.58-7.51 (m, 3H), 7.49-7.41 (m, 4H), 7.40-7.35 (m, 1H), 7.01 (dd, J = 8.5, 1.5 Hz, 1H), 6.10 (dd, J = 7.5, 2.8 Hz, 1H), 5.97 (d, J = 2.8 Hz, 1H), 5.16 (s, 2H), 3.80 (s, 3H), 3.52-3.48 (m, 2H), 2.99 (t, J = 6.0 Hz, 2H), 1.81 (s, 6H) 111

469 ¹H NMR (500 MHz, DMSO-d₆) δ 9.25 (br s, 1H), 7.56 (d, J = 7.5 Hz, 1H), 7.54-7.40 (m, 6H), 7.39-7.34 (m, 1H), 7.04-6.93 (m, 1H), 6.11 (dd, J = 7.5, 2.5 Hz, 1H), 5.97 (d, J = 2.5 Hz, 1H), 5.16 (s, 2H), 3.98-3.45 (m, 11H), 3.39 (s, 1H), 3.30- 3.21 (m, 2H), 2.25-2.10 (m, 1H), 2.05-1.74 (m, 2H), 1.73-1.60 (m, 1H) 112

420 ¹H NMR (500 MHz, DMSO-d₆) δ 9.17 (br s, 2H), 7.65 (d, J = 7.0 Hz, 1H), 7.62 (d, J = 1.8 Hz, 1H), 7.59 (d, J = 8.5 Hz, 1H), 7.44 (d, J = 8.0 Hz, 1H), 7.26 (d, J = 1.8 Hz, 1H), 7.14 (dd, J = 8.0, 1.8 Hz, 1H), 7.09 (dd, J = 8.5, 1.8 Hz, 1H), 6.57 (d, J = 2.0 Hz, 1H), 6.47 (dd, J = 7.0, 2.0 Hz, 1H), 4.37 (br s, 2H), 3.87 (s, 3H), 3.70 (s, 3H), 3.57-3.52 (m, 2H), 3.10 (t, J = 6.0 Hz, 2H) 113

434 ¹H NMR (500 MHz, DMSO-d₆) δ 10.15 (br s, 1H), 7.66 (d, J = 7.0 Hz, 1H), 7.63 (d, J = 1.5 Hz, 1H), 7.55 (d, J = 8.0 Hz, 1H), 7.44 (d, J = 8.5 Hz, 1H), 7.26 (d, J = 1.8 Hz, 1H), 7.14 (dd, J = 8.5, 1.5 Hz, 1H), 7.11 (dd, J = 8.0, 1.8 Hz, 1H), 6.57 (d, J = 2.0 Hz, 1H), 6.47 (dd, J = 7.0, 2.0 Hz, 1H), 4.67 (d, J = 13.5 Hz, 1H), 4.33 (dd, J = 14.3, 6.0 Hz, 1H), 3.87 (s, 3H), 3.86-3.79 (m, 1H), 3.71 (s, 3H), 3.55-3.47 (m, 1H), 3.24-3.15 (m, 2H), 3.01 (s, 3H) 114

388 ¹H NMR (500 MHz, DMSO-d₆) δ 9.10 (br s, 2H), 8.88 (d, J = 5.0 Hz, 2H), 7.58-7.52 (m, 4H), 6.99 (dd, J = 8.0, 1.8 Hz, 1H), 6.14 (dd, J = 7.5, 2.5 Hz, 1H), 5.86 (d, J = 2.5 Hz, 1H), 5.33 (s, 2H), 4.36 (br s, 2H), 3.68 (s, 3H), 3.57-3.52 (m, 2H), 3.11-3.05 (m, 2H) 115

426 ¹H NMR (500 MHz, DMSO-d₆) δ 9.28 (br s, 2H), 9.06 (s, 1H), 8.38 (s, 1H), 8.19 (s, 1H), 8.05-7.94 (m, 2H), 7.62 (d, J = 7.5 Hz, 1H), 7.56 (d, J = 8.0 Hz, 1H), 7.50 (d, J = 1.5 Hz, 1H), 6.99 (dd, J = 8.0, 1.5 Hz, 1H), 6.13 (dd, J = 7.5, 2.5 Hz, 1H), 6.09 (d, J = 2.5 Hz, 1H), 5.33 (s, 2H), 4.35 (br s, 2H), 3.69 (s, 3H), 3.56-3.50 (m, 2H), 3.12-3.05 (m, 2H) 116

426 ¹H NMR (500 MHz, DMSO-d₆) δ 9.30 (br s, 2H), 8.84 (s, 1H), 8.37 (s, 1H), 7.89-7.70 (m, 2H), 7.64-7.53 (m, 2H), 7.50 (s, 1H), 7.37-7.29 (m, 1H), 7.03-6.97 (m, 1H), 6.20-6.09 (m, 2H), 5.41 (s, 2H), 4.35 (br s, 2H), 3.69 (s, 3H), 3.58-3.50 (m, 2H), 3.13-3.07 (m, 2H) 117

440 ¹H NMR (500 MHz, DMSO-d₆) 10.79 (br s, 1H), 8.87 (d, J = 6.5 Hz, 1H), 8.41 (s, 1H), 7.90-7.78 (m, 2H), 7.61 (d, J = 7.5 Hz, 1H), 7.53-7.49 (m, 2H), 7.42-7.35 (m, 1H), 7.00 (dd, J = 8.5, 1.5 Hz, 1H), 6.15 (d, J = 2.5 Hz, 1H), 6.12 (dd, J = 7.5, 2.5 Hz, 1H), 5.43 (s, 2H), 4.62 (d, J = 14.0 Hz, 1H), 4.29 (dd, J = 14.0, 7.5 Hz, 1H), 3.80-3.75 (m, 1H), 3.69 (s, 3H), 3.55-3.46 (m, 1H), 3.23- 3.16 (m, 2H), 2.97 (s, 3H) 118

428 ¹H NMR (500 MHz, DMSO-d₆) δ 7.56 (d, J = 7.5 Hz, 1H), 7.52-7.35 (m, 7H), 6.94 (dd, J = 8.0, 1.5 Hz, 1H), 6.12-6.08 (m, 1H), 5.97 (d, J = 3.0 Hz, 1H), 5.15 (s, 2H), 4.77-4.72 (m, 2H), 3.82-3.72 (m, 2H), 3.69-3.65 (m, 3H), 3.82-2.78 (m, 1.3H), 2.71-2.68 (m, 0.7H), 2.16 (s, 3H) 119

467 ¹H NMR (500 MHz, DMSO-d₆) δ 9.15 (s, 1H), 8.38 (d, J = 8.3 Hz, 1H), 8.35 (d, J = 8.3 Hz, 1H), 7.84 (d, J = 7.5 Hz, 1H), 7.59-7.54 (m, 2H), 7.28 (d, J = 1.5 Hz, 1H), 7.08-7.03 (m, 2H), 4.70 (s, 0.8H), 4.68 (s, 1.2H), 3.88 (t, J = 5.5 Hz, 0.8H), 3.83 (t, J = 5.5 Hz, 1.2 H), 3.67 (s, 3H), 2.97-2.91 (m, 1.2H), 2.86-2.81 (m, 0.8H), 2.15 (s, 1.8H), 2.13 (s, 1.2H) 120

453 ¹H NMR (500 MHz, DMSO-d₆) δ 10.16 (br s, 1H), 9.15 (s, 1H), 8.42-8.35 (m, 2H), 7.85 (d, J = 7.0 Hz, 1H), 7.65 (d, J = 1.5 Hz, 1H), 7.61 (d, J = 8.5 Hz, 1H), 7.30 (d, J = 2.0 Hz, 1H), 7.13 (dd, J = 8.5, 1.5 Hz, 1H), 7.08 (dd, J = 7.5, 2.0 Hz, 1H), 4.70 (d, J = 12.5 Hz, 1H), 4.32 (dd, J = 14.5, 8.0 Hz, 1H), 3.91-3.83 (m, 1H), 3.72 (s, 3H), 3.52- 3.43 (m, 1H), 3.41-3.30 (m, 2H), 3.24-3.16 (m, 2H), 1.38 (t, J = 7.3 Hz, 3H) 121

467 ¹H NMR (500 MHz, DMSO-d₆) δ 9.80 (br s, 1H), 9.15 (d, J = 2.0 Hz, 1H), 8.42-8.35 (m, 2H), 7.85 (d, J = 7.5 Hz, 1H), 7.66 (d, J = 1.5 Hz, 1H), 7.62 (d, J = 8.5 Hz, 1H), 7.30 (d, J = 2.0 Hz, 1H), 7.14 (dd, J = 8.5, 1.5 Hz, 1H), 7.08 (dd, J = 7.5, 2.0 Hz, 1H), 4.58 (d, J = 13.0 Hz, 1H), 4.48-4.40 (m, 1H), 3.90-3.82 (m, 1H), 3.78-3.70 (m, 4H), 3.51- 3.42 (m, 1H), 3.38-3.15 (m, 2H), 1.45-1.36 (m, 6H) 122

386 ¹H NMR (500 MHz, DMSO-d₆) δ 9.43 (br s, 2H), 7.76 (d, J = 9.0 Hz, 2H), 7.70 (d, J = 7.0 Hz, 1H), 7.61-7.58 (m, 2H), 7.11-7.05 (m, 3H), 6.73 (d, J = 2.0 Hz, 1H), 6.68 (dd, J = 7.0, 2.0 Hz, 1H), 4.51-4.45 (m, 2H), 3.83 (s, 3H), 3.70 (s, 3H), 3.48-3.42 (m, 2H), 2.99 (t, J = 6.0 Hz, 2H) 123

402 ¹H NMR (500 MHz, DMSO-d₆) δ 9.27 (br s, 2H), 7.77-7.71 (m, 3H), 7.61-7.58 (m, 2H), 7.39 (d, J = 8.5 Hz, 2H), 7.09 (dd, J = 8.5, 2.0 Hz, 1H), 6.78 (d, J = 2.0 Hz, 1H), 6.69 (dd, J = 7.5, 2.0 Hz, 1H), 4.36 (br s, 2H), 3.70 (s, 3H), 3.56-3.51 (m, 2H), 3.10 (t, J = 5.5 Hz, 2H), 2.54 (s, 3H) 124

402 ¹H NMR (500 MHz, DMSO-d₆) δ 9.32 (br s, 2H), 7.75 (d, J = 8.5 Hz, 2H), 7.73 (d, J = 7.3 Hz, 1H), 7.62-7.58 (m, 2H), 7.38 (d, J = 8.5 Hz, 2H), 7.10 (dd, J = 8.5, 2.0 Hz, 1H), 6.78 (d, J = 2.0 Hz, 1H), 6.69 (dd, J = 7.3, 2.0 Hz, 1H), 4.49 (br s, 2H), 3.70 (s, 3H), 3.60-3.32 (m, 2H), 2.99 (t, J = 5.5 Hz, 2H), 2.54 (s, 3H) 125

414 ¹H NMR (500 MHz, DMSO-d₆) δ 9.34 (br s, 2H), 7.57 (d, J = 7.5 Hz, 1H), 7.53-7.50 (m, 2H), 7.49-7.41 (m, 4H), 7.40-7.35 (m, 1H), 6.99 (dd, J = 8.0, 2.0 Hz, 1H), 6.11 (dd, J = 8.0, 2.5 Hz, 1H), 5.98 (d, J = 2.5 Hz, 1H), 5.16 (s, 2H), 4.50 (br s, 2H), 3.70 (s, 3H), 2.89 (s, 2H), 1.42 (s, 6H) 126

400 ¹H NMR (500 MHz, DMSO-d₆) δ 9.44 (br s, 2H), 7.67 (d, J = 7.0 Hz, 1H), 7.63 (d, J = 1.5 Hz, 1H), 7.60 (d, J = 8.0 Hz, 1H), 7.25 (d, J = 8.5 Hz, 1H), 7.11 (dd, J = 8.5, 1.5 Hz, 1H), 6.92 (d, J = 2.5 Hz, 1H), 6.88 (dd, J = 8.5, 2.5 Hz, 1H), 6.37 (s, 1H), 6.34 (dd, J = 7.5, 1.5 Hz, 1H), 4.89 (br s, 2H), 3.79 (s, 3H), 3.70 (s, 3H), 3.49-3.43 (m, 2H), 2.99 (t, J = 6.0 Hz, 2H), 2.36 (s, 3H) 127

483 ¹H NMR (500 MHz, CD₃OD) δ 7.62-7.57 (m, 2H), 7.47-7.34 (m, 6H), 7.03 (dd, J = 8.5, 1.5 Hz, 1H), 6.29 (dd, J = 7.5, 2.5 Hz, 1H), 6.12 (d, J = 2.5 Hz, 1H), 5.18 (s, 2H), 4.55-4.43 (m, 2H), 3.72 (s, 3H), 3.38-3.14 (m, 12H), 2.14 (m, 4H) 128

420 ¹H NMR (500 MHz, DMSO-d₆) δ 9.43 (br s, 2H), 7.65 (d, J = 7.0 Hz, 1H), 7.61 (d, J = 1.5 Hz, 1H), 7.59 (d, J = 8.0 Hz, 1H), 7.44 (d, J = 8.5 Hz, 1H), 7.26 (d, J = 2.0 Hz, 1H), 7.13 (dd, J = 8.5, 2.0 Hz, 1H), 7.09 (dd, J = 8.0, 2.0 Hz, 1H), 6.56 (d, J = 2.0 Hz, 1H), 6.47 (dd, J = 7.0, 1.5 Hz, 1H), 4.49- 4.47 (m, 2H), 3.87 (m, 3H), 3.69 (s, 3H), 3.47- 3.43 (m, 2H), 3.00-2.97 (m, 2H) 129

434 ¹H NMR (500 MHz, DMSO-d₆) δ 10.82 (br s, 1H), 7.65 (d, J = 7.0 Hz, 1H), 7.62 (d, J = 1.5 Hz, 1H), 7.60 (d, J = 8.5 Hz, 1H), 7.44 (d, J = 8.5 Hz, 1H), 7.26 (d, J = 1.5 Hz, 1H), 7.14-7.09 (m, 2H), 6.56 (d, J = 1.5 Hz, 1H), 6.47 (dd, J = 7.0, 1.5 Hz, 1H), 4.79-4.76 (m, 1H), 4.53-4.42 (m, 1H), 3.87 (s, 3H), 3.72-3.68 (m, 4H), 3.42-3.40 (m, 1H), 3.08-3.06 (m, 2H), 3.00 (s, 3H) 130

469 ¹H NMR (500 MHz, CD₃OD) δ 7.59-7.56 (m, 2H), 7.47-7.45 (m, 3H), 7.42-7.39 (m, 2H), 7.37- 7.34 (m, 1H), 7.06 (dd, J = 8.5, 2.0 Hz, 1H), 6.29 (dd, J = 7.5, 2.5 Hz, 1H), 6.12 (d, J = 3.0 Hz, 1H), 5.18 (s, 2H), 4.70-4.49 (br m, 2H), 4.28-4.26 (m, 1H), 3.75-3.73 (m, 7H), 3.46-3.43 (m, 2H), 3.34- 3.33 (m, 2H), 2.46-2.43 (m, 1H), 2.21-2.08 (m, 2H), 1.91-1.86 (m, 1H) 131

386 ¹H NMR (500 MHz, DMSO-d₆) δ 9.26 (br s, 2H), 7.76 (d, J = 9.0 Hz, 2H), 7.70 (d, J = 7.0 Hz, 1H), 7.60-7.57 (m, 2H), 7.09-7.06 (m, 3H), 6.73 (d, J = 2.0 Hz, 1H), 6.68 (dd, J = 7.5, 2.0 Hz, 1H), 4.37-4.35 (m, 2H), 3.83 (s, 3H), 3.70 (s, 3H), 3.54-3.53 (m, 2H), 3.10 (t, J = 6.0 Hz, 2H) 132

400 ¹H NMR (500 MHz, DMSO-d₆) δ 9.39 (br s, 2H), 7.67 (d, J = 7.0 Hz, 1H), 7.59 (d, J = 8.0 Hz, 1H), 7.27 (d, J = 2.0 Hz, 1H), 7.25 (d, J = 8.5 Hz, 1H), 7.10 (dd, J = 8.5, 2.0 Hz, 1H), 6.92 (d, J = 2.5 Hz, 1H), 6.88 (dd, J = 8.0, 2.5 Hz, 1H), 6.37 (d, J = 2.0 Hz, 1H), 6.34 (dd, J = 7.0, 2.0 Hz, 1H), 4.36- 4.34 (m, 2H), 3.79 (s, 3H), 3.71 (s, 3H), 3.53- 3.52 (m, 2H), 3.10 (t, J = 6.0 Hz, 2H), 2.35 (s, 3H) 133

422 ¹H NMR (500 MHz, DMSO-d₆) δ 9.60 (br s, 2H), 8.11 (t, J = 58.0 Hz, 1H), 7.78 (d, J = 1.5 Hz, 1H), 7.68 (d, J = 8.0 Hz, 1H), 7.60 (d, J = 7.5 Hz, 1H), 7.48-7.36 (m, 5H), 7.22 (dd, J = 8.5, 1.5 Hz, 1H), 6.14 (dd, J = 7.5, 2.5 Hz, 1H), 5.99 (d, J = 2.5 Hz, 1H), 5.16 (s, 2H), 4.52 (m, 2H), 3.49-3.48 (m, 2H), 2.99 (m, 2H) 134

436 ¹H NMR (500 MHz, DMSO-d₆) δ 10.89 (br s, 1H), 8.15 (t, J = 58.0 Hz, 1H), 7.82 (d, J = 1.5 Hz, 1H), 7.69 (d, J = 8.3 Hz, 1H), 7.60 (d, J = 7.6 Hz, 1H), 7.47-7.36 (m, 5H), 7.23 (dd, J = 8.4, 1.5 Hz, 1H), 6.14 (dd, J = 7.6, 2.7 Hz, 1H), 6.00 (d, J = 2.7 Hz, 1H), 5.16 (s, 2H), 4.77 (m, 1H), 4.55 (m, 1H), 3.76-3.75 (m, 1H), 3.45-3.40 (m, 1H), 3.07- 3.02 (m, 5H) 135

404 ¹H NMR (500 MHz, DMSO-d₆) δ 9.54 (s, 2H), 7.71 (d, J = 7.2 Hz, 1H), 7.62-7.58 (m, 3H), 7.10 (dd, J = 8.3, 1.8 Hz, 1H), 7.01 (dd, J = 13.2, 2.4 Hz, 1H), 6.94 (dd, J = 8.6, 2.3 Hz, 1H), 6.62 (s, 1H), 6.53-6.52 (m, 1H), 4.48 (s, 2H), 3.95 (s, 3H), 3.69 (s, 3H), 3.45-3.44 (m, 2H), 3.00-2.97 (m, 2H) 136

418 ¹H NMR (500 MHz, DMSO-d₆) δ 10.71 (s, 1H), 7.71 (d, J = 7.2 Hz, 1H), 7.63-7.59 (m, 3H), 7.11 (dd, J = 8.3, 1.6 Hz, 1H), 7.01 (dd, J = 13.2, 2.4 Hz, 1H), 6.94 (dd, J = 8.7, 2.4 Hz, 1H), 6.62 (s, 1H), 6.53-6.52 (m, 1H), 4.80-4.77 (m, 1H), 4.45- 4.43 (m, 1H), 3.84 (s, 3H), 3.73 (br s, 1H), 3.68 (s, 3H), 3.42-3.34 (m, 1H), 3.07-3.06 (m, 2H), 3.00 (s, 3H) 137

426 ¹H NMR (500 MHz, CD₃OD) δ 8.81 (d, J = 7.0, 1.0 Hz, 1H), 8.38 (s, 1H), 8.02-7.99 (m, 1H), 7.92 (d, J = 9.5 Hz, 1H), 7.66-7.62 (m, 2H), 7.52-7.49 (m, 1H), 7.46 (s, 1H), 7.05 (d, J = 7.0 Hz, 1H), 6.33 (dd, J = 7.5, 3.0 Hz, 1H), 6.23 (d, J = 3.0 Hz, 1H), 5.50 (s, 2H), 4.55 (s, 2H), 3.72 (s, 3H), 3.60 (t, J = 6.0 Hz, 2H), 3.14-3.12 (m, 2H) 138

440 ¹H NMR (500 MHz, DMSO-d₆) δ 10.91 (br s, 1H), 8.86 (d, J = 6.0 Hz, 1H), 8.39 (s, 1H), 7.87- 7.79 (m, 2H), 7.61 (d, J = 7.5 Hz, 1H), 7.57 (d, J = 8.0 Hz, 1H), 7.51 (s, 1H), 7.37-7.35 (m, 1H), 7.01 (dd, J = 8.5, 1.0 Hz, 1H), 6.15-6.11 (m, 2H), 5.42 (s, 2H), 4.77 (d, J = 15.0 Hz, 1H), 4.43 (dd, J = 14.0, 6.0 Hz, 1H), 3.80-3.77 (m, 1H), 3.66 (s, 3H), 3.41-3.39 (m, 1H), 3.08-3.04 (m, 2H), 2.99 (s, 3H) 139

426 ¹H NMR (500 MHz, DMSO-d₆) δ 9.55 (br s, 2H), 9.01 (s, 1H), 8.33 (s, 1H), 8.11 (s, 1H), 7.97 (d, J = 9.2 Hz, 1H), 7.89 (d, J = 9.2 Hz, 1H), 7.61 (d, J = 7.6 Hz, 1H), 7.56 (d, J = 8.4 Hz, 1H), 7.50 (d, J = 1.6 Hz, 1H), 7.00 (dd, J = 8.4, 1.7 Hz, 1H), 6.13 (dd, J = 7.6, 2.7 Hz, 1H), 6.08 (d, J = 2.7 Hz, 1H), 5.31 (s, 2H), 4.46 (m, 2H), 3.67 (s, 3H), 3.44 (m, 2H), 2.97 (t, J = 5.7 Hz, 2H) 140

418 ¹H NMR (300 MHz, CD₃OD) δ 7.53-7.33 (m, 7H), 7.27 (d, J = 10.5 Hz, 1H), 7.28 (dd, J = 7.8, 2.4 Hz, 1H), 6.10 (d, J = 2.7 Hz, 1H), 5.17 (s, 2H), 3.79 (br s, 2H), 3.67 (s, 3H), 3.03-3.00 (m, 4H), 2.64 (s, 3H) 141

404 ¹H NMR (500 MHz, DMSO-d₆) δ 9.56 (br s, 2H), 7.61 (d, J = 6.0 Hz, 1H), 7.54 (d, J = 7.5 Hz, 1H), 7.50-7.37 (m, 6H), 6.14-6.12 (m, 1H), 5.99 (s, 1H), 5.16 (s, 2H), 4.46 (br s, 2H), 3.67 (s, 3H), 3.43 (br m, 2H), 2.94 (m, 2H) 142

414 ¹H NMR (500 MHz, DMSO-d₆) δ 7.57 (d, J = 7.5 Hz, 1H), 7.54-7.34 (m, 7H), 6.97 (d, J = 8.0 Hz, 1H), 6.10 (dd, J = 7.5, 2.0 Hz, 1H), 5.97 (s, 1H), 5.16 (s, 2H), 3.67 (s, 3H), 3.45-3.18 (4H, overlapping with solvent peak), 3.26 (br m, 2H), 2.96 (m, 2H), 1.33 (br m, 3H) 143

428 ¹H NMR (500 MHz, DMSO-d₆) δ 10.50 (s, 1H), 7.56 (d, J = 4.5 Hz, 2H), 7.52-7.38 (m, 6H), 7.01 (dd, J = 4.5, 1.0 Hz, 1H), 6.11 (dd, J = 4.5, 1.0 Hz, 1H), 5.97 (s, 1H), 5.16 (s, 2H), 4.60-4.53 (m, 2H), 3.78-3.70 (m, 2H), 3.70 (s, 3H), 3.40-3.28 (m, 1H), 3.18-2.98 (m, 2H), 1.44-1.39 (m, 6H) 144

472 ¹H NMR (500 MHz, CDCl₃) δ 7.48 (d, J = 8.5 Hz, 1H), 7.50-7.32 (m, 7H), 6.99 (d, J = 8.5 Hz, 1H), 6.90 (s, 1H), 6.34 (d, J = 6.5 Hz, 1H), 5.17 (s, 2H), 5.05-5.00 (m, 1H), 4.72-4.58 (m, 2H), 3.79 (br m, 2H), 3.76 (s, 3H), 2.82 (m, 2H), 1.42- 1.32 (m, 6H) 145

465 ¹H NMR (300 MHz, CD₃OD) δ 7.71 (d, J = 7.8 Hz, 1H), 7.63 (d, J = 8.4, Hz, 1H), 7.53-7.30 (m, 6H), 7.05 (dd, J = 7.8, 1.2 Hz, 1H), 6.60 (d, J = 7.6 Hz, 1H), 5.40 (s, 2H), 4.54 (s, 2H), 3.71 (s, 3H), 3.62-3.55 (m, 2H), 3.22-3.02 (m, 2H) 146

372 ¹H NMR (500 MHz, CD₃OD) δ 7.65 (d, J = 7.5 Hz, 1H), 7.57 (d, J = 8.2 Hz, 1H), 7.47 (d, J = 7.2 Hz, 2H), 7.42-7.36 (m, 4H), 7.03 (d, J = 8.5 Hz, 1H), 6.39 (dd, J = 7.6, 2.5 Hz, 1H), 6.21 (d, J = 2.5 Hz, 1H), 5.21 (s, 2H), 4.47 (s, 2H), 3.64 (t, J = 6.0 Hz, 2H), 3.20 (t, J = 6.1 Hz, 2H) 147

400 ¹H NMR (300 MHz, CD₃OD) δ 7.83 (d, J = 7.5 Hz, 1H), 7.62-7.57 (m, 2H), 7.45-7.40 (m, 5H), 7.09 (dd, J = 8.4, 1.6 Hz, 1H), 6.59 (dd, J = 7.5, 2.3 Hz, 1H), 6.36 (d, J = 2.3 Hz, 1H), 5.28 (s, 2H), 4.49 (s, 2H), 4.23 (q, J = 7.2 Hz, 2H), 3.68 (t, J = 6.1 Hz, 2H), 3.22 (t, J = 5.9 Hz, 2H), 1.35 (t, J = 7.1 Hz, 3H)

As compounds that bind strongly to MCH₁, compounds of formula I are expected to be effective in reducing obesity.

The present invention is not limited to the compounds found in the above examples, and many other compounds falling within the scope of the invention may also be prepared using the procedures set forth in the above synthetic schemes. The preparation of additional compounds of formula (I) using these methods will be apparent to one of ordinary skill in the chemical arts.

The invention has been described in detail with particular reference to some embodiments thereof, but it will be understood by those skilled in the art that variations and modifications can be effected within the spirit and scope of the invention. 

1. A compound of formula I:

wherein R¹ is H or optionally substituted alkyl; R², R³, R⁴ are each independently selected from H, —O-alkyl, —S-alkyl, alkyl, halo, —CF₃, and —CN; G is —CR¹²R¹³—NR⁵— or —NR⁵—CR¹²R¹³; R⁵ is H, optionally substituted alkyl, optionally substituted heterocycle, —C(═O)—R⁶, —C(═O)—O—R⁷, or —C(═O)—NR¹⁹R²⁰; R⁶ and R⁷ are each optionally substituted alkyl or optionally substituted heterocycle; R⁸, R⁹, R¹⁰, R¹¹, R¹², R¹³, R¹⁹ and R²⁰ are each independently selected from H or optionally substituted alkyl; R¹⁴ and R¹⁵ are each independently H or halogen; Y is N; L is —CH₂—O—, —CH₂CH₂—, —CH═CH— or a bond; and B is aryl or heteroaryl or cycloalkyl; with the proviso that, when L is a direct bond, B cannot be unsubstituted heteroaryl or heteroaryl monosubstituted with fluorine.
 2. A method of treating a disease or condition which is susceptible to treatment with an MCH₁ receptor modulator, comprising administering to a patient in need thereof a therapeutically effective amount of a compound according to claim
 1. 